Edifier TO-U3 Plus Noise Reduction Sports Wireless Bluetooth Earphones 1. Bluetooth version: V5.3 2. Bluetooth protocol: A2DP, AVRCP, HFP 3. Effective distance: about 10m 4. Power supply: lithium battery included 5. Operating time: about 7h ( earphone ) + 21h ( charging case ) 6. Input: 5V 200mA ( earphone ) 5V 1A ( charging box ) 7. Frequency range: 20Hz-20KHz 8. Sensitivity (SPL): about 94dB 9. Packing list: charging case x 1, earphones x 2, storage bag x 1, charging cable x 1, manual x 1 Features: 1. Charger with OLED screen, icons show connection, power and other status, clear and concise 2. 13mm composite diaphragm moving coil unit, strong resolution, the rich details of the music is truly reproduced, low, medium and high three-frequency balance 3. 65ms low-latency mode, sound and picture synchronization. 4. Bluetooth 5.3 module technology, anti-interference, low power consumption, fast and stable transmission 5. 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 6. Equipped with intelligent call noise reduction algorithms, intelligent reduction of environmental noise, to retain a clear human voice 7. IP54 level dustproof and waterproof, no need to be afraid of daily rain and sports 8. U-shaped half-ear curve, firmly fit the ear canal, stable and uniform force, long wearing comfort 9. Bluetooth one-key connection, no master-slave restrictions, single and dual senseless switching experience 10. Easy to operate with a touch of a button 11. Through Edifier Connect, you can freely define various functions of the headset, and the APP provides four different EQ modes for switching.