UCLEAR Digital HBC100 Plus Bluetooth Helmet Audio System for Motorcycle, ATV, UTV, and other Powersports Helmets - Single Kit Latest Bluetooth technology allows you to make and take cell phone calls, connect directly with another rider, and listen to your favorite music. Full-duplex intercom system allows 4 riders to communicate at a distance of up to 500 meters (0.36 miles) each. Boom-Free mic, high-quality speakers, noise suppression and patented ABF technologies eliminate road and engine noise and other ambient sounds for clear conversations. Ride in any weather, water and temperature resistant. Operating temperature of -29C (-20F) to 60C (140F) ensures reliable operation even in extreme weather. Voice-activated pick-up allows hands-free operation of incoming phone calls.