Talk over the intercom with your buddies, hear directions from you GPS, blast your favorite tunes and more, all through your Sena Technologies Cavalry Helmet! Composite fiberglass half shell construction Weight- 2.2 lbs. (34 oz.) Aerodynamic, low profile removable visor Fully integrated seamless speaker design, HD audio speakers built in and built in microphone Removable and washable head liner Four helmets can talk individually or together (Full Duplex) Intercom range up to 1/2 mile (open terrain/line of sight) Light weight and ultra slim profile - great for cruiser riders Universal Intercom - intercom with other brands Built-in FM Radio tuner, 10 station preset with auto scan Bluetooth 4.1 (latest 4th generation Bluetooth) Talk time: 10 hours - Stand-by 8 days Pairing for mobile phone +GPS Voice prompts and Audio Booster Bluetooth pairing for two mobile phone for music and calls Water resistant for use in inclement weather and Charge-on-the-Fly (can use while charging) Firmware upgradeable for free for life (must register the unit) Two-year warranty