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1.Bluetooth specification: V4.0+EDR
2.Bluetooth profiles supported: HSP, HFP, A2DP and AVRCP
3.Operating distance: 10 meters Class II
4.Waterproof : can be used in 3m deep water
5.Speaker:bone conduction
6.Working time : 4 hours
7.Frequency response:20Hz-20KHz
8.Power supply :DC3.7V
9.Input Sensitivity:≤400mV
10.Output power: left channel right channel  1.5W*2(4Ω)
11.Signal-to-noise ratio:≥82dB
12..Distortion rate:≤0.7%


1.This product adopting bone conduction technology to make people enjoy another entertainment style 
2. Can play music for all kinds of music , totally open
3. Built-in stereo CALSS-D function
4.Perfect sound quality
5.Bluetooth V4.0 , with CSR8645 Chipset
6. Suitable for sports , such as swimming , running , climbing