ZGA GS13 Phantom Open Wireless Bluetooth Earphone 1. Bluetooth version: 5.3 2. Music playback time: about 7H 3. Connection distance: about 10 meters 4. Headphone battery capacity: 50mAh 5. Charging time: about 1.2H 6. Charging compartment battery capacity: 400mAh 7. Charging interface: Type-C 8. Call time: about 5h 9. Ergonomic design, fits firmly and will not fall off 10. Open and not in the ear, easy to listen to, breathable and not stuffy 11. Silicone ear hooks, which wont slip off even if you sweat, and wont hurt when worn for a long time. 12. Dual-effect directional sound transmission, protecting privacy and preventing sound leakage 13. Comfortable listening experience, large 16mm dynamic unit, strong bass and bright treble 14. Create good sound quality with rich details, clear and transparent