Fangrui Product Details 1. Edifier To-u3 Plus Noise Reduction Sports Wireless Bluetooth Earphones 2. Bluetooth Version: V5.3 3. Bluetooth Protocol: A2dp, Avrcp, Hfp 4. Effective Distance: About 10m 5. Power Supply: Lithium Battery Included 6. Operating Time: About 7h ( Earphone ) + 21h ( Charging Case ) 7. Input: 5v 200ma ( Earphone ) 5v 1a ( Charging Box ) 8. Frequency Range: 20hz-20khz 9. Sensitivity (spl): About 94db 10. Packing List: Charging Case X 1, Earphones X 2, Storage Bag X 1, Charging Cable X 1, Manual X 1 11. Features: 12. Charger With Oled Screen, Icons Show Connection, Power And Other Status, Clear And Concise 13. 13mm Composite Diaphragm Moving Coil Unit, Strong Resolution, The Rich Details Of The Music Is Truly Reproduced, Low, Medium And High Three-frequency Balance 14. 65ms Low-latency Mode, Sound And Picture Synchronization. 15. Bluetooth 5.3 Module Technology, Anti-interference, Low Power Consumption, Fast And Stable Transmission 16. The Earphone Can Listen To Songs For 7 Hours With A Single Full, With The Charging Compartment With Up To 7 + 21 Hours Of Battery Life, Support For Fast Charging 17. Equipped With Intelligent Call Noise Reduction Algorithms, Intelligent Reduction Of Environmental Noise, To Retain A Clear Human Voice 18. Ip54 Level Dustproof And Waterproof, No Need To Be Afraid Of Daily Rain And Sports 19. U-shaped Half-ear Curve, Firmly Fit The Ear Canal, Stable And Uniform Force, Long Wearing Comfort 20. Bluetooth One-key Connection, No Master-slave Restrictions, Single And Dual Senseless Switching Experience 21. Easy To Operate With A Touch Of A Button 22. Through Edifier Connect, You Can Freely Define Various Functions Of The Headset, And The App Provides Four Different Eq Modes For Switching.