The ultra lightweight, discreet, behind-the-head wearing style makes it stable and comfortable - the perfect partner for your active lifestyle. High-definition audio with powerful surround sound provides spatial audio and enhanced bass. Noise-isolating ear buds allow you to escape from the crowd and immerse yourself in a rich music listening experience. While the headphones are wirelessly getting music from your device, they are also seamlessly connected to your compatible Bluetooth enabled phone. The built-in microphone allows you to take calls hands-free. When a call comes in, the music will mute and will resume when the call is finished. The S9HD connects to any Bluetooth compatible stereo-enabled (A2DP) devices or to any iPod with Bluetooth adapter (sold separately: See SKU 80501) providing access to the entire music library for a full wireless music experience.