Capacity Bike Headset: The thin earpads are specially designed for helmet inks, and the thickness is only 02 inches (07 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. " low" warning when is low. Depending on the usage environmentBuilt-in FM Radio: The intercom is equipped with FM radio function, and supports frequency 760 - 900 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 environmentBluetooth 50: 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 wireless10 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 make it easy to call while driving. Note: For 1 person, no intercom functionWaterproof, sweat, and dustproof: IPX 65 waterproof function is suitable for light rain, 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 dustSpecification:Type: Motorcycle Helmet IntercomB: Bluetooth 50+ EDR CSR8635Support Protocols: A2DP/AND/AVRCPBattery: 450mAh Lithium Battery (Included)Charge Voltage/Current: DC 5V/190mAFrequency: 24GHzAmplifier: HT4832SQWork Time: about 10 HoursPhone Connection Distance: 50mFeatures: Wireless, FM Radio, HI-FI Sound Quality,Siri, S-Voic, with MicLength: 85cm/335 inch (Approx.)Width: 5cm/197 inch (Approx.)Height: 2cm/079 inch (Approx.)Colour:Black+blueMaterial:ABS plasticPackage Contents:1 * Headset host1 * MIC and trumpets2 * Buckle inside helmet1 * Fixed folder1 * Screw driver2 * Screws1 * charging cable1 * English manualOnly 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.