Network frequency: GSM/GPRS/EDGE; 900/1800/1900MHz Nokia N91

Optional colors: silver, pure black music version (8GB version) Size/volume: 113.1× 55.2×22mm Weight: 164 grams Screen parameters: 260,000-color TFT color screen; 176×208 pixels; 2.1 inches Operating system: Symbian OS 9.1 Series 60 Third Edition MR model Talk time: 180-240 minutes Standby time: 190 hours WAP Internet access: supports Flying Notes. Date of launch: May 2006. Standard configuration: lithium battery (BL-5C 1020mAh), travel charger AC-4, desktop charger DT-10, data cable (USB) DKE-2, stereo Headphones HS-28 (with remote control), CD-ROM disc, including software (PC Suite and other applications), "User Manual", "Quick Start", "Additional Application Guide" and "Music Synchronization User Guide"

Edit basic functions of this paragraph

『Clock』『MP3 ringtone』『Scene mode』『Theme mode』『File manager』 Recording: Use the recording program to record your own voice. Optional ringtones: Format: AAC, eAAC, M4A, MIDI, WMA, AAC, AMR (NB-AMR), MP3, RealAudio, True Tones (WB-AMR), WAV Polyphonic ringtones: 64 Polyphonic incoming call ringtone recognition: Support grouped ringtone incoming call picture recognition : Standby picture for incoming call photo: Image browser: JPEG, GIF 87a/89a, WBMP, BMP, PNG Graphic menu: Theme mode: Downloadable new theme mode

Edit this communication function

『Built-in antenna』『Chinese SMS』『EMS SMS』『Conference call』『Voice dialing』『Call time reminder』『Electronic business card』『Address book group』『Call history』『EFR STK service』 Chinese input: Predictive input method: Supports all major languages ??in Europe and Asia-Pacific Extra-long text messages: Supports chain text messages Multimedia text messages: Combine images, video clips, text and sound clips and send them via MMS to a compatible phone or PC Automatically adjust The size of the megapixel image makes it suitable for sending via MMS (up to 300K attachments can be sent, subject to network support) Voice menu: Voice command Phone directory: Contacts: Advanced contact database, supports storage under each name Multiple phone numbers and email details, and also supports thumbnail pictures and business card grouping for hands-free calling: built-in hands-free speaker

Edit this paragraph Multimedia entertainment

『Built-in games』 Memory capacity: The normal version has a maximum storage capacity of 45MB; under normal circumstances, it has 15MB of running memory. The normal version has a storage capacity of up to 27MB when the hard drive is turned off. If third-party software is used ( If the process terminator closes unnecessary processes, the storage can reach 30MB) Built-in micro hard drive: 4GB (regular version)/8GB (black version) built-in dynamic storage, which can store music files, multimedia information, ringtones, images, and videos snippets and other applications; additional 16 MB of storage for business card folders, calendars, notepads, and text messages Java extensions: Java? MIDP 2.0, CLDC 1.1 (Connected Limited Device Configuration, [J2ME]); support over-the-air delivery Download Java? based apps and games Download Tone Games: "Over the Air" Download new music to your Nokia N91 Camera: Built-in camera Pixels: 2 Megapixels Sensor type: CMOS Zoom mode: 8x digital zoom Photo resolution : Still image resolution: 1600 x 1200 pixels (default 64

0 x 480 pixels) Continuous shooting: Supports timed shooting: Supported shooting modes: Supports macro shooting, Advanced photo modes: Still, continuous shooting, video recording, and options for nighttime, brightness adjustment, image quality, automatic timer photos Special effects: Support video shooting: video shooting with sound; video shooting: 3GPP H.263, MPEG4 Video playback: play video formats: H.263, MPEG4, Real Video 8; can play full-screen videos on mobile phones: watch downloaded files, streams Real-time streaming playback of media files or recorded large video clips: 3GPP standard streaming MP3 player: built-in 4GB; dedicated music keys: play/pause, fast forward, fast rewind, stop, dedicated keys can be used on music players and Automatically switch between used applications; can store up to 3,000 songs; supports audio formats (codecs) MP3, AAC, AAC, eAAC, Real, WAV, WMA, M4A, AWB, SP-Midi, AMR, AMR-WB , original sound, AMR-NB; intelligently designed music player, dedicated playback keys and volume control keys, enhanced playlist management – ??edit playlists, add new tracks; advanced music features: mixing, 5-band equalization Speaker, Loudness, Music DCR (Dynamic Range Compression, Dynamic Range Compression) View what is playing when the Nokia N91 is in standby Take a call while listening to music, the music pauses; when the call ends, the music resumes Radio: Built-in ;Visual radio, tap the visual radio mode to add rich new modes for you to listen to the radio

Edit this section Network and data transmission

WAP browser: WAP 2.0　WWW browsing Browser: XHTML/HTML browser, supports HTML 4.01 (including support for elements such as heat maps, background images, and frames), improving Web compatibility; supports a subset of JavaScript 1.5, which includes the most commonly used JavaScript Function that supports file upload over HTTP using standard HTML forms, small screen display options including fast page up/down scrolling style, full screen mode, download progress bar and adaptive history Bluetooth interface: built-in; Bluetooth v1.2; Bluetooth Wireless connection mode: Basic Printing Mode (BPP) supports the use of image printing or information printing, Human Interface Device Mode (HID) supports the use of the Nokia Bluetooth Wireless Keyboard application; wireless synchronization of business card holders and calendars via Bluetooth wireless technology Data cable interface: USB 2.0 full speed (USB mini), supports mass storage profile, music file management/SIM card-less operation does not interfere with music listening, uses USB or Bluetooth wireless technology to connect to Nokia PC Suite, and uses compatible connection devices to connect the phone and the compatible PC Local synchronization of business card and calendar data E-Mail: Convenient email client compatible with Nokia Wireless Keyboard (sold separately)

Edit this paragraph Others

Office Applications

Office Applications

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『Office Function』

Personal Assistant

『Alarm Clock』 『Calendar』 『Calculator』

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Nokia N91 is a multimedia terminal optimized for music Nokia N91

Display and keyboard with automatic brightness control Keys: two soft keys, call and end keys, 5 directions Navigation keys, S60 keys (Applications, Edit, Clear), ITU-T keyboard, Volume keys (Volume up and Volume down), Power key, Key lock Use Nokia HS-28 stereo headset with remote control or Use your own high-quality headphones to connect directly to the 3.5mm headphone jack on your Nokia N91 Nokia N91 external speakers OMA DRM 1.0 - includes no transfer

Send (for content protection), Combined Send, Separate Send and Super Distribution Offline mode: use of imaging and production functions with the radio turned off Open Mobile Alliance (OMA) DRM 2.0 for music file protection/digital rights management EGPRS, Class B, Multislot Class 10 (118.4/236.8 kbps upload/download rates) Note: Actual rates obtained may vary based on network support; GPRS, Class B, Multislot Class 10; Voice Codec: Full Rate , Enhanced Full Rate, GSM AMR transfers data from one 60 Series phone to another 60 Series phone Auto Redial Auto Answer (only works with compatible headsets or car kits), njkhbkghj Supports fixed dialing, i.e. Accessories that only allow calls to preset numbers include: Sennheiser PX 100, 200, PMX40 and PMX60 mini headphones; PXC 150, 250 and 300 NoiseGard dynamic noise canceling mini headphones; and HD465, 485, 515, 555, 595 high-fidelity headphones JBL Duet, OnTour, Creature II and Encounter speaker systems Harman Kardon Soundsticks II speaker systems Bose Triport and Quietcomfort 2 Acoustic Noise Cancellation Headphones 3.5mm standard in-line headphones Use HS-28 wire-controlled headphones Support 8-band EQ adjustment Hi-Fi quality audio user interface S60 Platform software version: Mobile Xinji Edition software version: 2.00.52; Regular version software version: 2.20.008 22-02-07 RM-158 N91 (49.01) The above software version is the latest version of the National Bank. The hardware version is RM-43: 5003_1 As the supreme flagship of Nokia's music phone product line, Nokia N91 is positioned as a "music-centered" product at the top of the pyramid. The purpose of Nokia N91's existence is to provide top music enthusiasts with a Hi-Fi-level perfect mobile music experience. The built-in 4GB micro hard drive and S60 operating system also make it the uncrowned king in this field.

Edit this paragraph Nokia N91 advantages and disadvantages

Advantages

Sound quality Unprecedented, if you simply compare the sound quality, it is undoubtedly better than any mobile phone. Don't imagine that any mobile phone with a price of tens of thousands can surpass the N91 in terms of sound quality. Comparing the iPhone and Sony Ericsson's so-called music mobile phone with the N91, there is a world of difference. Good feel, lots of software,

Disadvantages

Short standby time, poor screen material, unprotected camera, heavy weight Shortcomings

Edit this paragraph Nokia N91 review

Overall impression

The Nokia N91 is only available in two colors: lavender and silver gray. The full metal shell makes it look like It is extremely strong and can effectively protect internal components and help them dissipate heat better. As a relatively rare big guy in recent years, the N91's body measurements are 113.1 x 55.2 x 22 mm, and its weight is as high as 156 grams. However, this is understandable for a mobile phone that uses a 4GB micro hard drive as the storage medium.

Screen/Function Keys/Music Keys

According to convention, Nokia N-Series products will have their model number prominently marked on the fuselage, and N91 is no exception. Like the N70, the identity of the phone is also stamped on the upper left corner of the front. Further down is the N91 equipped with a TFT screen with a viewing area of ??2.1 inches and a standard material of 260,000 colors and 176×208 resolution. However, the display effect of N91 is average and does not bring us more surprises like N70 and 3250. At the bottom of the screen are the ribbon buttons of the Nokia N91.

If you look at this part alone, you might not think it is an S60 platform smartphone, because it only contains left and right function keys, answer/end keys and a five-dimensional joystick. Compared with the direction control units of the 3230 and 3250, the joystick of the N91 has not improved much in terms of ease of use. Although the positioning is accurate, the feedback force is slightly poor. It is still worth learning from the predecessor 6600. Down the functional area is the music playback button of Nokia N91. Unlike the 3250, which has to be turned around, we can find and use them on the front of the fuselage anytime, anywhere. The four directions up, down, left and right are used to control play/pause, stop, rewind and forward functions respectively, while the one in the center is just for decoration and has no practical significance. The individually designed button in the upper right corner is the player's shortcut key. Slider/numeric keys/right side of the fuselage N91 is the first product in the Nokia N-Series series of mobile phones to adopt a slider shape. But it is different from the upper and lower layers of 6270 and 6268, and it is also different from the "golden cicada escapes" of 8800 and 8910i. The "sliding" of this machine is limited to the module where the music playback key is located. This design is consistent with the 8850 and 8855 of that year. of. Nokia N91

The slide-open part of Nokia N91 is only about 2.8 centimeters, so the N91 sacrifices the size of the numeric keys and designs the ABC pen keys and C delete key arranged on the left and right sides into thin vertical ones. Long shape. In addition, the menu of Nokia N91 is on the right side of the fuselage. In this direction, the only silver-white button is particularly eye-catching.

Left side/top/bottom of the fuselage

On the other side of the fuselage, there are many "firsts". Here are the volume control keys used for the first time in Nokia Series 60 smartphones; and the first mini USB interface in N series products. The Nokia N91's 64-chord speaker hole is designed below the volume control keys. Although this is the only part of the entire fuselage that can produce sound, the volume is very loud. The vibration combined with the transparent ringtone ensures that users will not miss an incoming call to the greatest extent. The top of the N91 body is designed with a HOLD lock switch and a standard 3.5mm headphone jack. Next to it is a gold finger slot for wired control. Of course, the N-note switch key will not miss this part. There are relatively few elements at the bottom, with only one charging port. Since the N91 comes standard with an AC-4 charger, this jack is slimmer than previous products. Nokia N91 - right side view

Camera/Battery/Accessories

The birth of a batch of N-Series series mobile phones has marked the entry of Nokia mobile phones into the 2-megapixel era era. Although the N91 has not obtained the "Carl Zeiss" optical certification like the N90, nor can it support 3x optical zoom like the just-released N93, but as a mobile phone that pays more attention to music functions, the N91 is equipped with a 2 million The pixels are 4.8mm and the 1:3.2 camera is enough. Although Nokia N91 is not equipped with a large-capacity BP-6M battery like the 3250, the BL-5C lithium battery can still last for 3 days and 2 nights based on the calculation of about 10 minutes of calls, more than 20 text messages, and 15 photos per day. Use time. And if you play music continuously, it can also support more than 8.5 hours. Let me introduce to you the standard configuration of Nokia N91. In addition to the host, there should also be wire-controlled stereo headphones HS-28, lithium battery BL-5C, travel charger AC-4, USB data cable DKE-2, charging adapter CA-44, desktop charger DT-10, and CD-ROM CD and "User Manual", "Quick Start", "Additional Application Guide", "Music Synchronization User Guide", etc. If the user purchases the large-package "Sennheiser Music Special Edition", there will also be a PX200 over-the-ear stereo headset inside.

Compatibility issues

1 is the first smartphone released by Nokia to use the latest version of Symbian OS v9.1 operating system and based on the Series60 3rd Edition platform.

However, it is the same problem as the 3250 that was first launched on the market. Since the new S60 III platform has made changes in the compiler, system security model and core, the previous sis files must be compiled with the new compiler. Recognized and installed by the phone. When I logged into the official Nokia European website and tried to install the two games Punkwigs and Snakes, a Tunes Studio program and seven themes including blaster, Disc, Diversion, Hiphop, Rock, Techno and Turntable provided for the 3250 to the N91, Only Snakes, Hiphop, Rock and Techno are compatible. These compatibility restrictions are limited to third-party sis programs for the Symbian operating system. For the Nokia N91, the JAVA extension is based on the MIDP 2.0 environment and can also support Mobile 3D Graphics API (JSR 184) and Mobile Media API (JSR 135). You can use JBenchMark, which installs and runs the three versions of I, 3D, and HD, as well as the newly launched and more demanding SPMarkJAVA 06 to judge its quality. (JBenchMark I is not compatible) Nokia N91 - Evaluation 1

JBenchMark II/3D/HD and SPMarkJAVA 06 scores JAVA software score Nokia N91 achieved a good score of 519 points in the JBenchMark II test. Although this is still about 40 points behind the first place 3250, its advantage over the N70 and 6630 is unshakable. The scores of JBenchMark 3D are divided into four parts: High Quality, Low Quality, Triangles/s and KTexels/s. Nokia N91 scored 201 points in High Quality, ranking second among the four mobile phones. The final score of JBenchMark HD is also composed of four sub-items, which are: Fill rate, Textured, Smooth and Gaming. Selecting the Gaming link, Nokia N91 handed in an answer sheet of 146 points for users, Nokia N91-Evaluation 2

The gap with the first place 3250 is only 7 points, which is almost negligible. Finally, SPMarkJAVA 06 was installed for N91. Its test is divided into Game and Feature. The former includes three parts: High Detail 3D Game Test (high-quality 3D scene), Low Detail 3D Game Test (low-quality 3D scene) and 2D Game Test (2D game scene). The latter consists of four sub-tests: 3D fill rate, polygon throughput, Video Processing, Image Processing and Java Virtual Machine tests. N91 achieved a score of 2512 points.

Photography function

Nokia N91 has a built-in 2-megapixel camera, with an actual effective pixel of 1.92 million. Nokia N91-Camera

The maximum Take pictures with 1600×1200 resolution. However, since this machine is not mainly about taking pictures, its software functions are relatively simple, basically the same as those used by 6681, 6630, etc. back then. However, there is a big gap with the current mainstream N70, 3250, etc., let alone It can be compared with N90.

The camera software of N91 can support up to 8x digital zoom, and is equipped with three camera modes: night, continuous shooting and automatic timer, and three camera qualities of high, medium and normal. As always, framing lag is more severe in night mode. In addition, Nokia N91 also has five white balances including automatic, sunny, cloudy, incandescent and fluorescent, and four tones of normal, sepia, black and white and complementary colors.

Summary

In addition, the Nokia N91 can also shoot videos with unlimited sound at a resolution of 352×288, 174×144 or 128×96 pixels, and in the process , zoom, white balance and other functions are still effective.

Edit this section to review the upgraded version

Series60 III changes Because Nokia N91 is the world’s first officially released operating system using Symbian OS v9.1, Nokia N91 - display changes

Smartphone based on Series60 3rd Edition platform. The new platform has major changes from all previous versions. For example, the main menu can support the 12-square grid style, and the icons will also become smaller. The pair of small triangles originally displayed in the center at the bottom of the screen are replaced by the progress bar on the right, so that users can clearly understand the depth of the current path when browsing the menu. The main changes in Series60 III: The biggest new addition is the Flash player hidden under the "Audio and Video Tools" folder - Flash Lite Viewer 1.1. This tool will be integrated into the new Series60 III platform as standard, and will also appear in some smartphones that use the Series60 II and FeaturePack3 patch packages in the future (such as the Nokia N70). This is undoubtedly good news for friends who like to watch FLASH. In terms of mobile phone hardware, the new Series60 III platform has begun to officially support the Bluetooth v1.2 specification, WLAN (Wi-Fi) wireless local area network, third-party SD and mini SD memory cards, and QWERTY full-function keyboard. However, the above elements are not necessary and manufacturers can choose and adjust them according to the conditions of the product. For example, 3250 cannot support WLAN function. Nokia Use standard 3.5mm stereo headphones; Continuous music playback time is at least 10 hours; Large-capacity music storage space; Ability to create and edit playlists on mobile phones; Supports USB 2.0 high-speed transmission, and can automatically convert audio formats during the transmission process; It is at least compatible with audio files in MP3, WMA, AAC, AAC and M4A formats; music can be downloaded wirelessly quickly. As of 2008, among the mobile phones that Nokia has officially released, only 3250, N91, N71 and N80 comply with this XpressMusic music standard, and corresponding logos will also be posted in prominent positions on the packaging of these products. Introduction to music playback software Nokia N91's built-in RealPlayer player once again broke the previous record, its release time was 200 Nokia N91-Player Display

March 16, 2016, version number S60.30.11. 03D. It is compatible with up to 11 kinds of music files such as AAC, AAC, AMR (NB-AMR), eAAC, M4A, MIDI, MP3, RealAudio, True Tones (WB-AMR), WAV, WMA and 3GPP (H.263) , MPEG-4 and RealVideo format video files. Among them, compatibility with WMA music files is rare among Nokia mobile phones.

N91 uses a new interface for music playback software. Although the core is still based on RealPlayer and the functions are very powerful, it is very different from the previously released 3250. Its interface does not have any function icons. The upper right corner displays the number of the current track. In the middle is the name and artist of the music being played. Below that is a long progress bar that displays what has been played and what has not yet been played. time. If the song is supported, the corresponding album picture will also be displayed in the upper left corner of the screen. In terms of audio settings, Nokia N91 has seven equalizers including Acoustic, Super Bass, Hip-Hop, Pop Music, Ramp; B, Rock Music and Default, which can be further personalized through editing. The machine also supports channel balance adjustment and can turn on stereo expansion and louder modes. By default, N91 plays music in alphabetical order, but it also supports disorder, single repeat and all repeat, and the current song can be directly set as the ringtone through the menu. Line control, headset and sound quality evaluation Although Nokia's standard line control AD-36 and the AD-41 shipped with the 3250 are exactly the same in appearance, Nokia N91-Official Pictures

But the reason why they are different in model number is There are differences in aspects, mainly because the former uses a standard 3.5mm two-pin gold finger jack, while the latter uses a Pop-Port interface, so they are not compatible. Music playback functions can be completed by the four-way disc on the front. The side of the wired control is also designed with a volume control and a HOLD lock button. Together with the fixed clip on the back, it can be said that it has all the necessary qualities. In addition, the HS-28 headphones that come standard with Nokia N91 have excellent music restoration capabilities. Like the 3250 in-ear HS-20, the HS-28 also has the best mid-to-high frequency performance, especially the grasp of vocals and piano sounds. Even the friction between fingers and strings is so moving. Although the bass performance of HS-28 is also good, it always feels like it is shallow and insufficient. Users can plug their favorite standard 3.5mm headphones into the in-line AD-36, or connect them directly to the jack on the top of the fuselage. In the high-end sound quality test of N91, I once again chose the "Audio-Technica" C601. This product is characterized by low impedance and high sensitivity, so after using it with N91, the sound quality will be improved to a certain extent. Especially in the low frequencies, the increase in richness is the most obvious change, while the stronger mid- and high-frequency resolution also makes the human voice more real and natural. Menu/theme/scenario mode features: Although it can support the 12-square grid style, the Nokia N91 still uses the 9-square format menu Nokia N91-Information Mode

common in Series60. Of course, it can also be used through simple settings. Turn it into a list. By default, the N91 menu has 12 items: information, business card folder, camera, radio, music, audio and video tools, services, clock, my assistant, tutorial management, connection functions and tools. Regardless of whether third-party games or tools in sis or jar format are installed for it, its icon will appear in "My Assistant". Since Nokia N91 uses the new Series60 3rd Edition platform, there are relatively big problems in compatibility with previous sis files. Fortunately, Nokia also pre-installed four themes for the N91. Although they look much more ordinary than the four built-in 3250, they also provide a lot of convenience for users to further personalize their settings. Perhaps in order to reflect its music positioning in every detail, Nokia N91 also added a mode called "Music" to the "Scene Mode", making it Nokia's first preview model. Series60 smartphone with seven scene modes. In this way, if users receive an incoming call or text message while listening to music on their mobile phones, they can hear their favorite ringtone prompts. SMS/Phone Book/Management Tools Basic functions: Nokia N91 has five input methods: pinyin, strokes, numbers, uppercase English and lowercase English, which can be quickly switched by pressing the # key.

However, there is a small change when selecting Pinyin, from the original right to the down direction key. However, when selecting words, you only need to click on the number keys instead of long-pressing, which can still ensure the input speed well. In addition, N91 also retains the "delete" and "save" prompt function pioneered by 6630 when closing the currently entered text message, and the unlimited association of N90 and N70 has also been inherited. N91 still uses the traditional business card-style phone book of S60 mobile phones. Since it can dynamically share 20MB of body memory space, there is no restriction on entries. Each contact includes name, company, position, phone number, mobile phone, video phone, Internet phone, pager, fax and email. You can also add details such as position, title, nickname, push-to-talk, shared view, SIP, website, address, dual tone multi-frequency, birthday and notes, which is dazzling. However, the management tools of Nokia N91 are not much newer than the previous works of Nokia. They are still divided into program manager and file manager. A more practical one is added to the file manager for storing web browsing. The temp folder cached by the server. After activating "Current Standby Mode", 5 icons will be added to the desktop, which can be modified in "Current Mode Applications". This is undoubtedly a good supplement to custom shortcut keys. Dictionary/radio/help function Additional functions: Nokia N91 has a built-in English-Chinese and Chinese-English two-way dictionary, and its vocabulary library is stored on a microhard drive with a capacity of up to 4GB. Nokia has completely solved the problem of garbled Chinese characters displayed on Hong Kong mobile phones starting with the N70. This makes it easier for us to query Chinese and English explanations on the N91, especially when the phone lists all the phrases of the word. Listed, very comprehensive. Nokia N91 also supports the "visual radio" function. Of course, the prerequisite must be to plug in the included headphones. However, since Chinese operators have not yet provided support for this service, the attributive "visual" can only be used with "American". Its name is "" to describe it. N91 is relatively stable in receiving broadcast signals and has strong anti-interference ability. In addition to supporting both manual and automatic modes, it can also store 20 radio stations. Nokia N91 also has a built-in electronic tutorial in the menu. After activation, there will be nine options including welcome, prompts, synchronization, personalization, music, audio and video tools, interface, information and connection functions, and all of them are in Chinese interface, which is very intimate. USB, Bluetooth and wireless functions Connection functions: ***There are three ways to connect Nokia N91 to the computer through the standard data cable DKE-2. They are media player, PC suite and mass storage. The first two prerequisites are to install the N91 driver and the latest version of PC Suite on the computer (the version must be higher than 6.7, otherwise it will not be recognized). If you choose the last large-capacity storage mode, Windows 98 or above systems will be able to recognize the N91 as a removable disk with a capacity of 3.74GB, thereby achieving drive-free storage. In this state, it only takes 1 minute and 49 seconds to transfer a 97.5MB file to the phone, which is very satisfactory. The wireless transmission speed of Nokia N91 is also enough to show off. It is the second Series60 platform Bluetooth smartphone to break the 60 second mark. The third version of the S60 browser embedded in Nokia N91 has the most significant feature of "maintaining the original style and style of the page". Unlike other mobile browsers that directly shrink or even shrink web pages, the third version of the Nokia S60 browser first downloads all the web content and then displays it in a picture-like form. Users only need to use the navigation keys to move to select the part they are interested in, and then use the corresponding zoom keys to enlarge it to complete the reading work. The history page logged in by the user will not be cleared immediately. It is also stored in the phone's memory in the form of a picture. When the user wants to review the previous content again, he only needs to press the navigation key a few times, saving traffic and time.