SPECIFICATIONS:
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.   Rechargeable lithium battery: 300mAh
8.   Speaker: Ф40mm.
9.   Impedence: 32Ω
10. LINE-IN Plug:Ф3.5mm stereo 
FUNCTIONS:
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, Foldable style, easy to carry;
5, Ultra-soft padding and lightweight adjustable headband provide extreme comfort for long term wear