Bluetooth Headset 1. Bluetooth 5.0 connection technology, stable signal and fast transmission speed 2. Stereo, giving you a comfortable music experience 3. Built-in lithium battery for long life 4. IOS system equipment can display power 5. Support FM function, support TF card and 3.5mm stereo interface 6. Most compatible Bluetooth devices in the smart market 7. Unique appearance structure, comfortable to wear, suitable for different head shapes 8. The earmuffs can be folded at 90 degrees for easy storage Product parameters: 1. Drive: 40mm 2. Impedance: 32ohm 3. Bluetooth version: Bluetooth V5.0 4. Bluetooth frequency band: 2.4GHz 5. Power lev: Cl II 6. Bluetooth distance: barrier- 10m 7. Frequency response: 20-20000Hz 8. Support protocol: A2DP/AVRCP 9. Charging time: about 2 hours (power indicator charging: red light is on; full charge: red light is off, blue light is on) 10. Talk time: about 8-10 hours 11. Music time: about 8-10 hours 12. Standby time: about 120 hours 13. Battery capacity: 250mAh+ protection board 14. Charging interface: Micro USB