If you have any other questions, please contact us and we will respond with 24 hours!✓ [Extra Long Standby]: Newly Upgraded Lithium Battery, It Only Takes 2-3 Hours to Be Fully Chared and Can Work for 30 Hours.No need to wait for long charging time, No Need to Think About Charging Anytime.✓ [High Definition Sound Quality]: No LAG, No Delay, Using Directional Transmission, No Delay, No LAG in the Transmission Process, Synchronized with the Sound Transmission.✓ [Dual-Core Noise Reduction Chip]: Active Identification to Eliminate Noise, Suppress Whistling, Sound More Stable and Clearer.✓ [Ergonomic Design]: Comes with S, M, L Earmuffs, You Can Choose The Size.Conforms to the Human cochlea, Ensuring no fatigue for long time wearing.✓ [Lightweight]: Lightweight to Wear, Reduce Weight While Shrinking The Size, The Compact Design And The Color Close to Human Skin Tone Make It Almost Hard to Be Sea. If you have any other questions, please contact us and we will respond within 24 hours!✓ [Extra Long Standby]: Newly upgraded lithium battery, it only takes 2-3 hours to be fully charged and can work for 30 hours. No need to wait for long charging time, no need to think about charging anytime. ✓ [High Definition Sound Quality]: no lag, no delay, using directional transmission, no delay, no lag in the transmission process, synchronized with the sound transmission. ✓ [Dual-Core Noise Reduction Chip] :Active identification to eliminate noise, suppress whistling, sound more stable and clearer. ✓ [Ergonomic Design]: comes with S, M, L earmuffs, you can choose the size. Conforms to the human cochlea, ensuring no fatigue for long time wearing. ✓ [LIGHTWEIGHT]: Lightweight to wear, reduce weight while shrinking the size, the compact design and the color close to human skin tone make it almost hard to be seen.