Bluetooth version: 5.0 Bluetooth distance: 10 meters Charging box power capacity: 300mAh Charging box: can be charged more than 2-3 times Headphone battery: 40mAh Headphone continuous playback time: 5 hours Standby time: about 15 days Charging time: earphone charging for 1 hour Charging time of charging box 18 hours Charging box power input voltage: 5V Receiving sensitivity: 105DB+3DB Speaker specifications: 8mm Transmission frequency: 20hz- 20Khz Headphone size: 22.2*16.3*21mm Charging box size: 66.5*28.6 29.3mm