Lightweight and ultra slim design for nearly any size helmet, Bluetooth® specification v4.1, Bluetooth Intercom up to 900 meters (980 yards) in open terrain, Bluetooth® handlebar remote puts the controls where the rider can easily see and use them; fully functional while wearing gloves, Four-way conference intercom, Also uses the Universal Intercom™ to communicate with all Sena and non-Sena Bluetooth® headsets on the market, Voice Prompts, Bluetooth stereo headset by A2DP, Bluetooth music playback control by AVRCP: play, pause, track forward and track back, Sufficient sound level with integrated audio booster, Bluetooth hands-free for Bluetooth mobile phones, Bluetooth headset or stereo headset for Bluetooth GPS navigation, Water-resistant for use in inclement weather, Advanced Noise Control™, Music sharing allows talk or share playlists with the four-way intercom function, Built-in FM radio tuner with a station scan and save function, Up to 10 hours talk time, seven days stand-by time, Can be used while charging on road trips, Individual volume control for each audio source, Firmware upgradeable, 10S Smartphone app makes configuration a snap – change settings, set groups of intercom friends and access a Quick Guide; pair up to two mobile phones for convenient hands-free calling, 2- Speakers, 2- Foam speaker covers, 4- Speaker pads, 1- Wired boom microphone, 1- Wired microphone, 1- Boom microphone holder, 2- Microphone sponges, 1- Battery pack, 1- Battery pack holder, 1- USB power/data cable (micro USB type), 1- 10R cigarette charger