Features: Brand new and high quality Allows 4 sets of devices to connect at the same-time in a maximum intercom ranges of 1500meters. 4 riders can freely share the riding experience and enjoy conversation. Connecting to the upgraded Bluetooth-compatible 5.1 version, motorcycle interphones can automatically answer or reject calls within 5s. You could also listen to music and road conditions with FM radio while riding. With improved noise cancellation technology, it reduces surrounding wind and background noise. You are allowed to enjoy Bluetooth-compatible voice with high definition sound quality during riding at a high speed. Motorcycle helmet Bluetooth-compatible headset runs on a 750mAh large rechargeable battery. With just 2 hours of charge, the intercom working-time can reach 18hours and the standby-time can reach 150hours, suitable for long-time riding. With IP65 waterproof, the headset could handle almost all weather conditions. It is suitable for full-face helmet, 3/4 helmet, flip-up helmet and most half-face helmets which can cover ear. Specifications: Material:ABS Bluetooth-compatible version: 5.1 Battery parameter: 3.7V/750mAh Electrical parameters: DC5V1A Charge interface: 3.5mm round hole interface/earphone interface. Temperature: service temperature:-10-50 Waterproof grade: IP65 Packing size: Approx.15.5x10x6cm/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