Capacity Bike Headset: The thin earpads are specially designed for helmet inks, and the thickness is only 0.2 inches (0.7 cm), so it is comfortable to wear with a helmet. Built-in 450 mAh lithium battery with low energy consumption, 2 hours of charge can standby for about 360 hours, and can be used continuously for about 12 hours. "Power low" warning when power is low. Depending on the usage environment Built-in FM Radio: The intercom is equipped with FM radio function, and supports frequency 76.0 - 90.0 MHz. You can listen to FM broadcast and understand news and road information at any time. Our travel is interesting. The reception status of the FM will change depending on the usage environment Bluetooth 5.0: The device connection speed is fast and stable, it will automatically connect after connecting to your smartphone. When in use, you can discard the wired restrictions to listen to calls and music and enjoy the freedom of wireless 10 Second Auto Answer & Hands-Free Calling: With the convenience of mind, when you get your phone on the bike, you just hear it in 10 seconds and then you will receive a call with double Press to easy to call while driving. Note: For 1 person, no intercom function Waterproof, sweat, and dustproof: IPX 65 waterproof function is suitable for , rain, snow, etc. In order to provide a better experience, this product adopts soft material. The headphone hole adopts unique design. It can be used for a long time to prevent sweat and dust Specification: Type: Motorcycle Helmet Intercom B: Bluetooth 5.0+ CSR8635 Support Protocols: A2DP/AND/AVRCP Battery: 450mAh Lithium Battery (Included) Charge Voltage/Current: DC 5V/190mA Frequency: 2.4GHz Amplifier: HT4832SQ Work Time: about 10 Hours Phone Connection Distance: 50m Features: Wireless, FM Radio, HI-FI Sound Quality,Siri, S-Voic, with Mic Length: 8.5cm/3.35 inch (.) Width: 5cm/1.97 inch (.) Height: 2cm/0.79 inch (.) Colour:Black Material:ABS plastic Package Contents: 1 * Headset host 1 * MIC and trumpets 2 * Buckle inside helmet 1 * Fixed folder 1 * Screw driver 2 * Screws 1 * charging cable 1 * English 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.