New upgraded retractable function, Metallic effect shell, intelligent noise reduction/HD sound quality. Active noise reduction for calls, filtering out noise, making voices clearer, Built-in noise reduction chip, intelligently filtering out noise, effectively reducing the impact of noise on recording. Bluetooth 5.3 chip connects in one second, stable and continuous, Bluetooth 5.3 chip, high response transmission, music, games, , calls are smooth and without delay. Applicable to 99% of electronic devices with Bluetooth, Intelligently compatible with computers, mobile phones, tablets and other devices of and systems, strong compatibility, can be connected and used with Bluetooth. Stable and reliable, suitable for travel in multiple scenarios, Clip clothes and they will not fall off no matter how you toss, no need to worry about losing the headphones, answer at any time. Bluetooth version:Bluetooth 5.3 Charging voltage:DC5V Talk time:about 50 hours Standby time:about 360 days Charging :Type-C charging port 0 Transmission frequency:2.4GHZ Charging time:less than 30 minutes Music time:about 33 hours Battery capacity:250MAH Supported protocols:HANDSET/HANDFREE/A2DP/AVRCP Main functions: 1. Incoming call vibration reminder function 2. Intelligent voice reminder, incoming call number report 3. Chinese and English bilingual switching 4. Battery display 5. One-to-two, can connect two mobile phones at the same time 6. Single ear answering 7. Receiving function Type:A:Single earphone Colour:As Shown Material:Plastic Package Contents: 1 * Retractable wireless earphones Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.