IPX6 Waterproof Sweat Resistant Bone Conduction Headphones Bluetooth V5.0 Open Ear Wireless Headset Sweatproof w/Mic - for Cycling Running Driving Gym 

----------by Premium manufacturer of bone conduction headphones in China, Shenzhen WinTo Technology Co., ltd

1.Bluetooth Version: V5.0
2.Chipset:Qualcomm QCC3003
3.Bluetooth Profiles:HFP v1.7, A2DP v1.3, AVRCPv1.5  
4.Decoder: SBC, AAC
5.Transmission Distance: 20m
6.Playing Time:5H
8.Charging Time:1.5H
9.Standby Time: 15 days
10. Battery: 3.7V/140mAh            
12.Frequency Range:20Hz~20KHz
13.Sensitivity:84±3dB
14.Impedance:10Ω
15. Color: Black; Green