Listen to music Answer incoming calls Voice guidance Voice call. Support for for for for and other smartphones Compatible with notebook. Desktop computers and other digital settings. The latest CSR4.0and Bluetooth technology is used, with super strong signal transmission and ultra-low power consumption. All Bluetooth devices are equipped with automatic answering function, which automatically answers calls within 5 seconds without manual answering. It is safe and fast, with a built-in high-quality anti-interference microphone that can effectively achieve hands-free answering and hanging up calls. High fidelity sound, with functions such as up and down song, volume adjustment, playback pause, automatic callback, etc., easy to operate This helmet Bluetooth earphone is carefully designed by the designer based on the internal structure of the motorcycle helmet, full helmet, and half helmet. It uses CSR's latest 4.1and Bluetooth technology, super strong signal transmission, ultra-low power consumption, and supports all Bluetooth devices. It also supports automatic answering function, so you no longer need to manually answer calls when you make a call. It is safe and fast. Supports up and down song, volume adjustment, playback pause, automatic callback and other functions, with simple operation and convenient use. Product weight: 166g 1. Bluetooth version: V4.0and 2. Frequency range: 2.4026GHz-2.480GHz 3. Transmission distance: 10M (transmission distance varies due to environmental factors and mobile phone Bluetooth devices) 4. MIC distance: 1 meter 5. Lithium battery: 3.7V or 500mA 6. Charging time: 4-5 hours 7. Standby time: about 180 hours 8. Continuous working time: about 32 hours 9. Bluetooth name: BT12 Applicable to full-face helmet or half-face helmet, off-road helmet, flip helmet Color: Black Material: plastic Package Contents: 1 x Helmet Bluetooth headset 1 Set x accessories 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.