Bluetooth™ v4.1 intercom up to 1.2 Kilometers. Four-way Intercom, Group intercom, Audio Overlay, Music Sharing, Voice Prompts, Advanced Noise Control™, Can be used while charging on road trips, Water resistant for use in inclement weather, Built-in FM radio tuner with a station scan and save function, Smartphone App for iPhone and Android, Optional Sena remote control support (not included), Firmware upgradeable.