Features: Brand new and high quality The Bluetooth-compatible chip of helmet bluetooth-compatible headset is 5.1, which fixes the problem of the devices low call volume and makes call more stable. Motorcycle bluetooth-compatible headset adopts advanced noise reduction technology to eliminate the noise of call, so that the sound you hear is more clear and stable, with 3D sound effect. With FM function, you can listen to enjoyable music and road conditions while riding. Waterproof grade IP65, freely use in rainy day. suittable mobile phones, GPS, MP3 and other bluetooth-compatible devices, with auto-receiving call and voice assistant function. Built-in rechargeable lithium-ion battery, motorcycle helmet bluetooth-compatible intercom only takes 3hours to fully charge with type-C charge cable. The standby-time can reach 260h and call/music playing-time is as long as 22h, which can meet the needs of long-time cycling calls. Motorcycle intercom is suitable for most full-face helmets and open helmets, and the installation is quite simple.Keep your riding safe and comfortable. Specifications: Bluetooth-compatible version: 5.1 Battery parameter: 3.7V/750mAh Electrical parameters: DC5V1A Temperature: service temperature:-10-50 Waterproof grade: IP65 Packing size: Approx.15.58x10x6cm/6.1x3.93x2.36inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Motorcycle Intercom 1x Earphone 2x Helmet Clip 4x Loop fasteners 1x Charge Line 1x Instructions 1x Shipping mark