The V4C 1000m Four-Way Full Duplex Motorcycle Helmet Dual-Ear Wireless Bluetooth Intercom allows motorcycle riders and passengers wearing helmet to stay in contact while calling hands-free on Bluetooth phone wirelessly. Four-way intercom allows up to 4 people to communicate in full duplex with each other at the same time. Riders can also listen to stereo Bluetooth music and FM radio. Built-in 360mAh lithium battery provides more than 8 hours of talk time. Plus, it comes with an arm band for added convenience. It surely is worth your investment!