B350s Bone Conduction Headphone with 8g Memory Card, MP3 Player, Sports Headphones, Outdoor Earphone, by bone conduction headphone supplier in China,  Shenzhen WinTo Technology Co., Ltd 

1.Bluetooth Version: V5.0
2.Chipset:Bluetrum 8832
3.Bluetooth Profiles:                                     
4.Decoder: SBC,AAC
5.Transmission Distance: 15m
6.Playing Time:6H
8.Charging Time:2H
9.Standby Time: 10 days                                         
10. Battery: 3.7V/180mAh           
12.Frequency Range:20Hz~20KHz
13.Sensitivity:84±3dB
14.Impedance:16Ω
15.Color: Black/Grey; Wine Red