Step 1: Sync your music to your Apple Watch by first setting up your iPhone's playlist in your phone's Apple Watch software:
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1. Keep the Apple Watch connected to the iPhone and turn on Music in My Watch.
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2. Select [Synced List] (default is none) from the playlist on your iPhone.
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3, when the Apple Watch is charged, it will complete the synchronization process of iPhone music, and copy the music on the iPhone to the watch. In this way, even if the watch and the phone are not connected, the watch can play music.
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Step 2: Set Aple Watch as the music source, the method is: enter the Apple Watch [music], press the screen hard, when the Force Touch menu appears, select [source], change the source from iPhone to Apple Watch.
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If the watch is not paired with a Bluetooth headset, it will be forced to pair a Bluetooth headset.
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Step 3: Let the Apple Watch pair the Bluetooth headset directly by:
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1. Go to [Settings] of Apple watch and select [Bluetooth].
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2, the Bluetooth headset to the matching mode (generally off, long press the Bluetooth headset power button until entering the matching mode, please see the Bluetooth headset instruction manual).
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3, then the Apple watch can search for the Bluetooth headset, click on it to match.
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4, when you use the Bluetooth headset, it will prompt you to connect to two devices (different headphones prompt different ways).
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5, then use the Apple watch to play music, even if the phone's Bluetooth is turned off, the Bluetooth headset can still hear the music.