Specification:
1, Bluetooth Version: V2.1, Chipset: CSR
2, Transmission distance: 10M
3, Frequency Response: 20Hz-20KHZ
4, Talk Time: 12 hours
5, Standby Time: 150 hours
6, Bluetooth Sensitivity:-85dB
7.    Build-in speaker mic
8.    Speaker: Ф40mm.
9.    Impedence: 32Ω
10.  LINE-IN Plug:Ф3.5mm stereo 
Function:
1,Integrated Bluetooth technology with MP3 music, Allow you to convert Music and Phone calling freely
2,Support Bluetooth stereo device entirely to receive A2DP stereo music.
3,LINE-IN available, which can be used to listen music by connecting to PC;
4, Built-in rechargeable lithiumbattery 300mAH.
5,Foldable style, easy to carry;
6,Ultra-soft padding and lightweight adjustable headband provide extreme comfort for long term wear