Air Conduction Bluetooth Earphones With Transparent Digital Display Case 1. Bluetooth solution: Bluetooth V5.3 2. Speaker: 14.2 copper ring speaker 3. Chip: BlueTrum BT5656 4. Standby time: 120H 5. Use time: about 4-5H, the charging box can charge the earphones 2 times + 6. Charging time: about 1.5H 7. Communication distance: barrier-free 10-15 meters 8. Battery capacity: earphones 40mAh, charging box 300mAh (with IC protection board) 9. Charging port: Type-C 10. Waterproof level: IPX5 11. Weight: about 85g 12. Charging box size: about 9.6 x 6.4 x 3.3cm Features: 1. No fear of sweating during running and climbing, skin-friendly silicone material makes it lighter to wear, and adjustable ear-hanging structure makes it more stable to wear 2. Communication is smoother, and DT5.0 directional sound transmission technology is accurately transmitted 3. 130-degree rotating structure, easy to adjust the angle 4. Open-type does not enter the ear, making it more comfortable to wear, and open-type does not leak sound, making listening more private 5. Bluetooth 5.3 has stable transmission and strong signal, and the connection speed and stability are greatly improved 6. No sense of delay, easy to play games 7. Supports multiple fast charging protocols and is compatible with multiple models