UCLEAR Digital 211224 HBC200 HD Force Bluetooth Helmet Audio System (Single Kit) Bluetooth Technology, enjoy fully hands-free operation of your cell phone, including making phone calls and browsing music Connect with an unlimited number of riders privately and simultaneously. The extended range of communication allows users to speak to lead riders even if they are outside of the line-of-sight Cross-brand compatible, easily integrated with most other Bluetooth helmet communication systems on the market Hi-definition speakers with built-in microphone delivers exceptional voice clarity and noise-cancelling ABF technology eliminate virtually all background noise Weather resistant, HBC200 HD helmet audio system will continue to function reliably at temperatures as low as -30C/14F and up to 60C/140F