Bluetooth version:  4.2
Frequency:20-20000HZ.  
Sensitivity:-42±3db
Battery capacity:700Mah. 
Headset capacity:50Mah
Headset play time: 2-2.5 hours. 
Headset work time: 4 hours
Headset size: 16*28.82mm
Output:760MV/Rms
Transmission power: CLASS 2, maximum 4.0dBm

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