K23 TWS Hanging Ear Earphones Air Conduction Bluetooth Headset 1. The open binaural listening method avoids the squeezing pain caused by in-ear headphones on the ear canal, making it more comfortable to wear 2. The advanced Bluetooth 5.3 technology ensures the quality of audio and video while effectively shortening the transmission interval of audio and video to achieve high-speed and stable transmission 3. HIFI sound quality, digital sound enhancement technology, restore the natural sound of the scene 4. Adopt pulse TD3.0 adaptive directional sound transmission, detect the shape of the ear canal, automatically adjust the propagation angle of the integrated sound beam, ensure that the sound is efficiently transmitted to the ear canal, and effectively reduce 89% of sound leakage 5. Intelligent CVC8.0 noise reduction technology, effectively solve the interference of environmental noise during the call, greatly improving the call quality 6. Touch adjustment, quick and convenient Technical Parameters: 1. Bluetooth version: 5.3 2. Charging interface: TYPE-C 3. Single earphone weight: 11.5g, whole machine weight: 93g 4. Battery capacity (headphone): 100mAh 5. Battery capacity (battery box): 450mAh 6. Music time: about (medium volume) 14H, talk time 14H 7. Charging times of the charging case: 2 8. Speaker diameter: 16.2MM 9. Transmission distance: 10m 10. Speaker impedance: 16 ohms 11. Sensitivity: 116dB +3dB 12. Frequency range: 20HZ-20KHZ 13. Charging compartment input voltage: DC5V-1A