Nextel Prime offer you i11 Bluetooth Version: Dual-mode Bluetooth V5.0 + EDR, ultra-low power consumption Support protocol: A2DP1.3/HEP1.6/HSP1.2/AVRCP1.6/D11.3 Bluetooth Usage Band: 2.4 GHZ Bluetooth transmission distance: 15-25 meters Battery capacity: headphones: 30 mAh, charging bin: 300 mAh Standby time: 6 hours for TWS earphones Call/playback time: earphone playback time: about 2-3 hours, earphone call time: about 4 hours (support telegram number, iOS system power display)