Fangrui Product Details 1. Wh850i Anc Active Noise Reduction Over-ear Bluetooth Headphone 2. Features: 3. Anc Active Noise Reduction: The Noise Reduction Depth Is 25db, Which Can Easily Handle Various Environmental Noises And Give You A Quiet World. 4. Game Mode: 40ms Ultra-low Latency, Closely Synchronized Audio And Video, Precise Listening And Positioning, Fully Immersing Yourself In The Game Battlefield To Help You Win Easily, And Feel The Thrill Of Man-machine Integration. 5. Wired Mode: Even When There Is No Power, You Can Use The Aux Audio Cable, Which Can Be Plugged Into A Computer And 3.5mm Audio Port. 6. Bluetooth 5.3 Chip: Using Bluetooth 5.3 Version, You Can Listen At Will Within A Connection Distance Of 10 Meters. 7. Super Long Battery Life: Built-in 400mah Lithium Battery, Up To 45 Hours Of Use In Bluetooth Mode, 35 Hours Of Use In Noise Reduction Mode, And 500 Hours Of Standby Time. 8. Lightweight Head Bow Design, Ergonomic Design, Comfortable Fit, Stable And Will Not Fall Off 9. The Earmuffs Are Made Of Full-ear Protein Leather And Zero-pressure Memory Foam, Which Are Soft Against The Skin, Light And Breathable. 10. 40mm Dynamic Unit, Strong Performance, Restores Delicate Audio Details, Thick Bass, Clear Treble, Can Analyze Every Sound Well, Making The Sound More Vivid. 11. Specifications: 12. Bluetooth Version: V5.3 13. Transmission Range: About 10m 14. Transmission Frequency: 2.4g-2.48g 15. Supported Protocols: Hfp1.7 Hsp1.2 A2dp1.3 Avrcp1.6 Spp1.2 Pbap1.0 16. Standby Time: 500h 17. Talk Time: 40h 18. Bluetooth Mode Music Time: 45h 19. Noise Reduction Mode Music Time: 35h 20. Charging Time: 2h 21. Headphone Battery: 400mah 22. Speaker: 40mm 32ohm Pet Diaphragm 23. Speaker Frequency: 20hz-20khz 24. Delay After Game Mode Is Turned On: 50ms (+-10ms) 25. Signal-to-noise Ratio: 95db 26. Product Weight: About 426g