BOROFONE BW73 Lucky Open True Wireless BT headset - black

1. Bluetooth 5.4 chip: JL AC7003 2. Battery capacity: charging case 300mAh; Headset 30mAh 3. Use time: 4 hours 4. Size: 84*59*26.5mm; Total weight: 57.5g 5. Support master-slave switching, up and down song switching, summoning Siri and other functions 6. OWS open true wireless bluetooth earphones, not in-ear hanging wear