1. Bluetooth 5.4 Chip: JL AC6983D22. Battery capacity: Charging case 300mAh Headsets 30mAh3. Usage time: 4 hours4. Material: ABS； Size: 51.5 * 49.2 * 21.3mm Total weight: 38g5. Support master-slave switching, up and down song switching, summoning Siri and other functions
