1.Bluetooth Version: V5.0 2.Chipset:Airoha 1526P 3.Bluetooth Profiles:HFP 1.7, HSP 1.2, A2DP 1.3, AVRCP 1.5, SPP 1.2 and Voice command,iOS battery monitor 4.Decoder: SBC, AAC, 5.Transmission Distance: â?¥15m 6.Talking Time:2.5-3H 7.Music Time:2.5-3H 8.Charging Time:1.5H 9.Standby Time: 63H 10.Earbuds Battery: 3.7V/50mAh 11. Charging box Battery: 400mAh 12.Frequency Range:20Hz~20KHz 13.Speaker size:Φ6mm 14.Sensitivity:70±3dB 15.Impedance:16Ω