Edifier Huazai Zero X Wireless Noise Reduction Sports 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. Use time: about 7h+ 21h 6. Input: 5V 200mA ( earphone ) 5V 1A ( charging box ) 7. Frequency range: 20Hz-20KHz 8. Sound pressure level: about 94dB 9. Packing list: charging case x 1, earphones x 2, Type-C charging cable x 1, manual x 1 Features: 1. The upper shell of the charging compartment is made of high-gloss nano NCVM vacuum coating process, which refracts a delicate and soft luster on the light flow, and the same color splicing, simple and dynamic 2. Space capsule charging case, more convenient and easy to take the earphone, open-type magnetic absorber 3. U-shaped arc semi-in-ear structure, as light as nothing comfortable, smooth curve firmly fit the ear canal, effectively balancing the ear pressure 4. Built-in 13mm PET diaphragm dynamic unit, strong resolution, rich sound details, low, mid and high frequency balance 5. Backward inverted sound architecture, expanding the diaphragm triggered by air vibration amplitude frequency, bass details more full 6. Bluetooth V5.3 chip module, stronger anti-interference, faster response time 7. Game mode delay can be as low as 0.06s, sound and picture synchronization 8. AI intelligent call noise reduction algorithm, significantly reduce the environmental noise, effectively improve the clarity of the caller's voice 9. After the headset is paired for the first time, it can be used again to connect back automatically, smart and fast 10. Download Edifier Connect APP to unlock more useful functions, switch different EQ modesearphone shutdownreal-time power checkcontrol settingslocation to find the earphoneBluetooth settings 11. Touch operation, simple and fast 12. Master-slave switching, left and right ear can be used separately 13. IP54 grade dustproof and waterproof, resisting sweat and rain spla