1. Rich usage scenarios, compatible with a variety of helmets, compatible with conventional 3.5mm interface headphones, in addition to the standard hard label, customers can bring their own 3.5mm interface wired headphones DIY, rich use experience, small and generous appearance, not only limited to helmet headphones, can also be DIY Bluetooth receiver use, home environment can also be used. 2. Automatic answering function for incoming calls, support automatic answering of incoming calls, after the call is broadcast, it will automatically connect after the phone number is broadcast, escorting your riding. 3. Supports simultaneous connection of 2 mobile phones, and can pair 2 mobile phones at the same time for easy switching. 4. function buttons, "+" and "-" keys can increase or decrease the volume, and can also switch songs. When using, you can accurately switch functions and ride safely. 5. The Bluetooth 5.0 high-performance chip is used, with a 1000mah large-capacity high-standard battery for long-lasting battery life. Supports language assistant, often press the "multi-function button" to wake up assistant, and the language assistant navigation and listening to songs are more convenient. The light luxury and simple appearance is matched with the blue pearlescent effect, young and energetic Bluetooth version: 5.0 Supported protocols: A2DP, HFP, , VRCP, SPP Usage range: 10 meters (up to 30 meters in a specific environment without obstacles) Microphone distance: 1 meter Frequency range: 2.402-2.480GHZ Battery capacity: 3.7V/1000MAH Charging time: about 4 hours Working time: about 18 hours Standby time: 360 hours Working temperature: -10-50℃ Material: Plastic colour: Blue Package Contents: 1 x Bluetooth Motorcycle Helmet Headsets 1 x USB Cable 1 x english User Manual 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.