Universal Helmet Wireless Bluetooth Headset Motorcycle Interphone 1. Bluetooth version: V4.0 + EDR 2. Frequency range: 2.4026 GHz-2.480 GHz 3. Transmission distance: 10M (transmission distance due to environmental factors and mobile phone bluetooth devices vary) 4. MIC distance: less than 1 m 5. Lithium battery: 3.7V 150mA 6. Charging time: 1 hour 7. Standby time: about 160 hours 8. Continuous working hours: about 8 hours 9. Using the latest 4.0 + EDR Bluetooth technology, signal transmission, low power consumption, support for all bluetooth devices 10. Wirelessly listen to music with integrated bluetooth technology 11. Fashion design, let music surrounding your life any time 12. Hands free function, truly free your hands 13. Set-in rechargeable Li-ion battery, long stand-by and working time 14. 4.0 type of CSR bluetooth chip, Hi-Fi earphone 15. Support power displaying on iPhone, easy to know when will to be charged 16. DIY design, available to be detachable when you want 17. Sound reminder function, easy to set the device according to sound remind