Fangrui Product Details 1. Open Comfortable Hanging Ear Ows Bluetooth Earphones 2. Bluetooth Programme: Ab5656t3 3. Support Bluetooth Protocol: A2dpavdtpavrcprfcommhfphspspphid 4. Bluetooth Version: V5.4 5. Frequency Range: 2.402ghz-2.480ghz 6. Transmission Distance (barrier-free): About 10m 7. Speaker Impedance: 16 Ohm 14.2mm 8. Speaker Output Power: 5mw 9. Sensitivity: 119db 10. Frequency Range: 20hz-20khz 11. Signal-to-noise Ratio: Greater Than 90db 12. Battery Capacity: Single Earphone: 50mah; Charging Case: 300mah 13. Use Time: About 4-5.5h 14. Standby Time: About 120h 15. Charging Voltage: Dc 5v 1a 16. Charging Time: About 1h 17. Charging Case Size: About 6.8 X 8 X 2.7cm 18. Features: 19. 14.2mm Large Moving Coil, Cd-grade Lossless Sound Quality, Graphene Diaphragm, High-fidelity Moving Coil Unit, Bass-heavy Bio-diaphragm 20. Ergonomic Ear Design, Airy And Soft To Wear, Outdoor Sports Running Without Falling Off 21. 360-degree Ultra-clear Surround Sound, Enjoy The Panoramic Space Sound Effect 22. Noise-cancelling Ultra-high-definition Calls, Improve Clarity And Fidelity 23. Synchronised Audio And Video For A More Immersive Gaming Experience 24. Bluetooth 5.4 Chip, High Compatibility, Anti-interference Ability, More Stable 25. Automatic Boot Back To The Connection, Single And Double Ear Mode Can Be Seamlessly Switched Without Disconnection 26. Intelligent Digital Display Charging Compartment, Remaining Power At A Glance 27. Easy Operation, Sensitive Induction