Edifier Huazai Magic Air Noise Reduction 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. 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. Inner bracket and earphone decorations are created by high-gloss nano NCVM vacuum coating process, and the charging compartment is UV sprayed for a smooth texture 2. U-shaped arc semi-in-ear structure, zero-pressure wearing ear technology, firmly fit the ear canal, effectively balance the ear pressure, comfortable wearing 3. 13mm large size composite diaphragm dynamic unit, strong resolution, restore sound details, PU titanium composite diaphragm 4. Dual MIC call noise reduction, extracting clear vocals and reducing external interference 5. After completing the first pairing to use again when opening the lid can be automatically connected back, intelligent and convenient 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. Touch operation, easy and convenient 9. Master-slave switching, left and right ear can be used separately 10. Through the APP, you can freely define various functions of the earphone, locate and find the earphonereal-time check the earphone power, customize the control commands and earphone naming 11. IP54 grade dustproof and waterproof, resisting sweat and rain splash 12. Reset Bluetooth with 3 clicks on the charging case button, long press on the charging case 3S to link to a new device