Sony h.ear on 3 Mini Wireless Help Manual page 46

The headset can be paired with multiple devices, but can only play music from 1 paired device at a time.
Related Topic
How to make a wireless connection to Bluetooth devices
Connecting to a paired computer (Windows 7)
Listening to music from a device via Bluetooth connection
Disconnecting Bluetooth connection (after use)
Initializing the headset to restore factory settings
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