Wireless connections Bluetooth: 5.0 Bluetooth protocol: HFP/A2DP/ HSP/AVRCP Communication distance: 10 meters (accessible open space) Double headphones continuous listening time: About 4 hours Headphone standby time: About 150 hours Single earphone battery capacity: 43mAh Charging box battery capacity: 300mAh Headphone charging time: About 1.5 hours Charging box charging time: About 2 hours Single earphone net weight: About 4.1g With the total net weight of the charging box: About 35.4g Charging box size: 62×40×27.2mm Headphone size: 26.65×16.4×21.6mm