SainSonic BM-7 Bone Conduction Headphone Led Light Both Sides, FCC Certified, Open & Safer, No Hearing Impairment, Revolutionary, Waterproof, Bluetooth 4.0, Wireless &ndash; Midnight Black BONE CONDUCTION technology uses vibrations to transmit audio information into your skull without blocking or covering your ears. OPEN EAR HEADSET design allows music and phone call audio while still hearing everything around you. BLUETOOTH 4.0 allows 10 meters of clear range connection. 2 in 1 wireless connection allows 2 mobile device pairings into the headset simultaneously. HANDS-FREE HEADSET designed with control buttons allowing a mobile phone the ability to ring, answer a call, hang up and adjust the volume ergonomically. COMFORTABLE curve over ear to assure proper secure fit and lighter weight. Sweat resistant durability blocks out moisture and precipitation. TWO YEAR MANUFACTURER'S WARRANTY comes with protective carrying storage pouch. FCC ID: 2AHGV-BM-7.