There are two ways for Apple Watch to listen to music:
1. One way is to connect with iPhone, or connect with computer through Wifi, and then use Apple Watch as the remote control to remotely play the music in iPhone or computer iTunes software.
2. Another way is to synchronize the music in the iPhone to the Apple Watch, set it in the Apple Watch app of the phone, open the music in my watch, and select the playlist on your iPhone from the synchronized list (none by default). When the Apple Watch is in the charging state, the synchronization process of the iPhone music will be completed, and the music on the iPhone will be copied to the watch. In this way, even if your watch and mobile phone are not connected, the watch can play music.
the way to connect an Apple watch to a bluetooth headset (stereo bluetooth headset is best) is also very simple:
1. enter the settings of apple watch and select bluetooth.
2. Set the Bluetooth headset to the matching mode (generally, after turning off the phone, press and hold the power button of the Bluetooth headset until it enters the matching mode. Please refer to the manual of the Bluetooth headset for details).
3. At this time, Apple watch can search for your Bluetooth headset and click it to match it.
4. When you use the Bluetooth headset again, it will prompt you to connect to two devices (different headphones prompt in different ways).
5. Then you play music with Apple watch. Even if you turn off the Bluetooth of your mobile phone, you can still hear music in the Bluetooth headset.