Xstars KW40 Bone Conduction TWS earbuds open ear Sports wireless earhook Features:Bluetooth Version: 5.0Bluetooth distance: 10mSpeaker driver diameter:F16mmSpeaker driver sensitivity:110dB±3dBImpedance:32Ω±15%Frequency respond:20HZ-20KHZCharging cabin battery capacity:200mah dual MOS protectionEarbuds battery capacity:40mahMusic play time: 5h; Call time: 6h;Charging time: 1h; Stand by: 12hCharging port:micro USB Send inquiry