Fits securely and directs music into your ears for full, uninterrupted audio. In-line microphone Lets you enjoy hands-free calls. Splash-resistant housing Provides protection from sweat and water, so you can easily wear headphones while working out. 9mm drivers Deliver powerful sound. Dynamic transducer design For reference-grade audio. 103dB/mW sensitivity Provides powerful audio. Stereo design Delivers crisp tones. Lightweight design Provides lasting comfort while listening.