【Upgraded 4 Riders Group Intercom】V4 Plus Motorcycle Bluetooth Intercom allow you to connect 4 riders meanwhile for conference intercom, total range up to 1500 meters. Also, this intercom system is suitable for soccer or handball referees. | 【Clear and Stable Sound】With improved CVC noise reduction technology and Bluetooth 5.1version, even in a noisy environment of 120km/h or in noisy stadium, the high-fidelity speakers also can make the sound you hear clear and stable. | 【Hands-Free Communications and Multi-Functional】The V4 Plus motorcycle communication system can automatically answer or reject calls within 5s. After paired with your phone, you can listen to enjoyable music and road conditions with FM radio while riding. The mobile voice assistant is supported. | 【Low Power Consumption】After circuit optimization, the power consumption is reduced by 20%. Just 2 hours of charging, talking time is up to 18 Hours and music playing time is up to 24 Hours. | 【Compatibility】It is compatible with full-face helmet, 3/4 helmet, flip-up helmet and most half-face helmets which can cover ears. The motorcycle helmet Bluetooth headset can withstand 14℉ to 122℉ and can be used in most countries and regions.