AfterShokz Bluez 2S Open-ear Wireless Stereo Headphones (Black) Bone conduction technology uses vibrations to transmit sound waves directly to the cochlea. Connectivity Technology: Wireless Open Fit assures unmatched ambient sound awareness and extended comfort Dual microphones deliver clear communication even in noisy environments NEW FEATURES: Premium Pitch+ 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.