Aftershokz Bluez 2 Open Ear Wireless Stereo Headphones, AS500, Color: Black Bone conduction technology uses vibrations to transmit sound waves directly to the cochlea.Connectivity Technology: Wireless OpenFit assures unmatched ambient sound awareness and extended comfort PremiumPitch patented dual suspension transducers guarantee the finest bone conduction audio Nanotechnology treatment effectively repels sweat when used while working out Dual microphones deliver clear communication even in noisy environments