Bluetooth Version: 5.0 Blueturn 5616 Battery inside earphone: 60mAh with protect PCB Battery inside chargingcase: 400mAh with Protect PCB Speaker: 9mm Impedance: 32ohm Frequency:20-20kHz Sensitivity: 105dB+-3dB Working time: 8-10hours Standby time: 168hours LED display in charging case Rubber paint color box