Hello, I am very happy to answer your question. Generally, speakers that are plugged into a USB flash drive support the MP3 file format. This format cannot play the accompaniment directly. But it can be achieved and solved in other ways. I don’t know what kind of speaker you have, as long as it can produce sound, as long as it is a speaker, as long as it is a good speaker. Even if it has no functions, it will not affect your enthusiasm for singing karaoke. I'll give you a few solutions for your reference. Hope it helps and inspires you.

First, most speakers have an AV interface (the round one, red or white one.), or a built-in 3.5mm audio interface (the kind that plugs in mobile phone headphones), buy one Connect the 3.5mm audio AV interface data cable to the mobile phone, then open the mobile karaoke software, such as the Changba app, and directly use the mobile phone as music accompaniment. It also has a built-in reverberation effect, which should be fine. Connect the audio microphone and you can sing karaoke.

The second type has an AV interface and a 3.5MM plug, and can be equipped with a Bluetooth module. You can directly connect Bluetooth with your mobile phone and use the 3.5mm jack to connect headphones. Then open the Bluetooth module, insert the 3.5mm plug, and plug the other end into the audio AV interface. Open the karaoke software on your mobile phone and you can directly karaoke wirelessly.

The third option is that now that there is a Bluetooth module, you can DIY your old speakers into Bluetooth speakers. This module costs less than 10 yuan. It can be plugged into a USB flash drive, a TF card, Bluetooth, a DIY microphone, and a computer sound card, instantly turning your antique speaker into a multimedia speaker.

The fourth method is to download the music accompaniment directly to the USB flash drive, plug it into the Bluetooth module or audio USB interface, and play the accompaniment. Use music APP, QQ Music, Kugou Music (these two software have more song copyrights and more content), search for "Chinese Accompaniment" and download it on demand. When finished, copy it to the USB flash drive. Some songs in these two software require membership to play or download, but there are also free ones. I usually use the software Getmusic to download (this software can be downloaded from Baidu), and you can download all songs from these two music platforms for free. I have been using it for almost 3 years and it is very easy to use and has powerful functions.

The fifth method is to use a Bluetooth wireless microphone to connect to a mobile phone, then plug in a 3.5mm cable to connect to the speaker, and then open the mobile karaoke APP to perform wireless karaoke.

The sixth method is to use this wireless microphone to connect to a Bluetooth speaker, then open the mobile phone karaoke app, connect the 3.5mm, connect to the AV interface, and use the mobile phone audio as accompaniment. Can have the same effect.