BC300 bone conduction headphone, 8H playtime by Shenzhen Winto technology co ltd 1.Bluetooth Version: V5.2 2.Chipset:BK3296 3.Bluetooth Profiles: A2DP/HFP,HSP,AVRCP,GAVDP,AVDTP 4.Decoder: SBC, AAC 5.Transmission Distance: 10m 6.Playing Time:8H(60% volume) 7.Charging Time:2H 8.Standby Time: 200H (w/bluetooth connected); 9. Battery: 3.7V/180mAh 10.Frequency Range:20Hz~20KHz 11.Sensitivity:86±3dB 12.Impedance:8 13.Dimension:142x105x42mm 14.Weight:around 32g 15.Color:Black,White, Gunmetal 16.Speaker type: Bone conduction transducers 17.Speaker size: 15*12mm 18. Material: Hypothermia Titanium alloy &PC & Silicon 19.Voice assistant: Compatible with Siri & Google assistant 20. Waterproof: IPX7