Characteristics and Interoperability Gjby CA-6 Wireless BT Music Sports TWS In-ear Headphones With an earbud, you can listen to crystal-clear sound, make calls, be cord-free, and enjoy your music. Details Talk time: approximately 45 hours; BT Version: 5.1 PIay Transmission range: 6–10 meters Charging Box Battery Capacity: 300mAh; Impedance: 32Ω Regular reaction: 50 Hz–20 kHz BT operating frequency: MIC, -42dB+-2, 2.402GHz–2.4480GHz About 2.5 hours for charging 112±3dB is the sensitivity. Voltage used to charge: DC5V-1A Support protocol: AVRCP, HSP, HFP, A2DP Standard for executive: GB/T14471-2013 Time on Standby: Approximately 240 hours