... -resistance, FM Promotion 500m motorcycle bluetooth intercom/Interphone for helmet kit,enabled FM radio,MP3 plug bluetooth interphone,bluetooth helmet interph ... and road noise.2 year replacement warranty. General Specifications* Bluetooth v2.1* Up to 33 feet RF coverage (from the phone ... ,Bluetooth Walkie Talkie 500m motorcycle bluetooth intercom/Interphone for helmet kit,enabled FM radio,MP3 plug