Fangrui Product Details 1. Edifier X3 Air Wireless Stereo Bluetooth Earphone 2. Bluetooth Version: Bluetooth V5.3 3. Bluetooth Protocol: A2dp, Avrcp, Hsp 4. Effective Distance: About 10m 5. Power Supply: Lithium Battery Included 6. Usage Time: About 6.5h (headset) + 19.5h (charging Case) 7. Input: 5v-200ma(headphone) 5v-1a(charging Case) 8. Frequency Range: 20hz-20khz 9. Sensitivity (spl): About 94db 10. Packing List: Charging Case X 1, Headphones X 2, Earbuds X 4, Charging Cable X 1 11. Features: 12. Lightweight And Compact, Comfortable To The Ear 13. Master-slave Switching, Seamless Connection 14. 0.06s Low Latency Rate, Audio And Video Synchronization 15. Bluetooth 5.3 Chip, Fast Connection, Stable Signal 16. Ip55 Level Dustproof And Waterproof, Easy To Cope With Sweaty Sportsrainy Day Traveling 17. Ai Call Noise Reduction Technology, Accurately Recognizes And Separates Environmental Noise And Human Voice, Removes Noise Interference, Clear And Stable Calls 18. Balanced Tri-frequency, Rich In Detail, Beautiful Vocals, Layered, Natural And Real 19. Connect With Edifier Connect App, Support Rich Customization Settings