Bullet Points: 1、Motorcycle Helmet Headphones : Has a 20-30m transmission distance and is with strong and stable connection. This helmet headphones suits great as motorcycle headphones. It will automatically reconnect after it is turned on the second time. 2、Well Designed : With built-in 450mAh lithium battery, this helmet earphone can maintain 360h standby time and 18h working time after fully charged. Well designed.Qualified as helmet earphones. 3、FM Radio Function : The range of the FM radio function of the helmet headset is from 76.2 to 108MHz. As long as you are in an open place, you can receive the local broadcast channels. 4、Support Hands Free : Wearing the helmet headphones, the headphones will help to automatically answer the call within 10 seconds. You do not need to stop your motorcycle to answer it. It can reject or hang up the call. Recommended. 5、Waterproof : The helmet headset is with IP67 waterproof function. It can adapt to various harsh environments. You should feel safe to use it even it is raining or snowing. Description : This helmet headphones suits great as motorcycle headphones since it has a 20-30m transmission distance and is with strong and stable connection. And it will automatically reconnect after it is turned on the second time. Specifications : Name : Motorcycle Helmet Headphones Lithium Battery : 3.7V / 450mAh Charging Voltage : 5V Standby Time : 360 Hours Function : FM radio / music / can be connected to a walkie-talkie Package Includes : Main Body of Headphone *1 Headphone Kit *1 Headphone Clip *1 Fixed Plate *1 Screwdriver *1 Long Screw *2 Short Screw *2