Aftershokz Bluez 2S Wireless Bone Conduction Bluetooth Headphones, Red, (AS500SR) Bone conduction technology uses vibrations to transmit sound waves directly to the cochlea OpenFit assures unmatched ambient sound awareness and extended comfort Dual microphones deliver clear communication even in noisy environments NEW FEATURES: PremiumPitch+ patented dual suspension transducers guarantee premium stereo sound and adds more bass and a more dynamic sound range. NEW FEATURES: IP55 certified sweat resistance repels sweat and heavy rain.