Fangrui Product Details 1. X999 Mini Wireless Noise Reduction With Digital Display Charging Bin Bluetooth Earphone 2. Bluetooth: 5.1 3. Signal Transmission Channel: Cassl2 4. Rf Transmission Power: 90db 5. Microphone Sensitivity: 42db 6. Transmission Range: About 10-15m 7. Transmission Rate: 24mbps 8. Battery Capacity: 40mah For Earphones, 400mah For Charging Bin 9. Use Time: About 4-5h 10. Charging Interface: Type-cusb-c 11. Input Voltage: Dc 5v 1a 12. Features: 13. Mini Body Shape, No Feeling Of Wearing, Comfortable And Invisible 14. In-ear Noise Isolation Design, Tight Fit 15. Simple And Compact, Easy To Carry 16. The Charging Box Has A Power Display, Which Is Convenient For Understanding The Power Situation 17. Singlebinaural Switchable, Low Latency Voice Calls, Binaural Surround Sound 18. Packing List: 19. - Charging Case X 1 20. - Bluetooth Headset X 2 21. - Power Cord X 1 22. - U-shaped Ear Cap X 2 23. - Round Ear Caps X 2