Bluetooth version 5.0 Pairing name Xi6-TWS Bluetooth Call Speaker Protocol (HSP) support Bluetooth Call Hands Free Protocol (HFP) support Bluetooth music (A2DP) support Bluetooth Music Remote (AVRCP) support Communication distance (accessible space) 10 meters (iPhone 5, 6, 7) RF power / RF rating up to 8dBm / (Class II) Audio output power (10% distortion, 1KHZ signal test) 40mW Speaker impedance 16 ohms Playing music time 2-3 hours Microphone patch microphone -42dB±3dB Headphone battery Type Lithium ion polymer battery Capacity 3.7 V 50mAh (581013, 50MAH) Fully charged time approx. 1.5 hours Shutdown current up to 0.4 uA Standby current (link state) (average) max. 0.5mA Operating current (average) approx. 10mA Charging current 30mA Light red and blue two-color lamp Battery full voltage 4.1~4.25V Mobile charging box section Type Lithium ion polymer battery Capacity 3.7 V, 400 mAh, 602040 Fully charged time about 2 hours Shutdown current up to 6 uA Charging current 70mA Indicator light red blue light Charging interface Micro_USB Charging voltage DC 4.7~5.25V The total weight of the product is 35g, charging box: 28g, single earphone: 3.5g