1, Bluetooth 5.3; chip: JL AC69832, Battery capacity: charging case 300mAh; headset 30mAh3. Use time: 4 hours; Standby time: 150 hours4, Size: 54.2*46.6*22mm; Total weight: 45g5. Support master-slave switching, up and down music  switching, summoning Sir, pressure sensitive operation and other functions6, with lanyard