I have to say what a great pair of headset I have never had a pair like this you don't have to have them synced to just one device So my two girls can use them together but listen to there own music and cut back on fighting so to me this is great and everyone should have a pair.

Here is info about them if that helps.

1.Bluetooth Transmission Range: 10 Meters
2.Operation Mode: Smart Touch
3.Compatible: Any devise with Bluetooth capability.
4. LED Digital Display, Real-Time Power Display, Power Level At A Glance
5. The Left And Right Ears Can Be Used Separately And Can Be Independently Matched With Bluetooth Devices
6. Smart Touch Design, Easy To Operate
7. Bluetooth 5.1, Low Power Consumption

Packing List:
1*Bluetooth Headset(L)
1*Bluetooth Headset(R)
1*charging box
1*data cable
1*manual