Jawbone Bluetooth headset features revolutionary Noise Shield technology that virtually eliminates background noise. Jawbone's Noise Shield technology uses an advanced, military-grade noise-canceling system that continuously adapts to the users' changing environment to deliver and receive unparalleled audio quality. Combined with its award-winning design, the Jawbone headset is perfect for those on the go and for those who need the conveniece of Bluetooth® in challenging environments. Jawbone can be worn on either ear, and you can customize your fit by choosing an earloop and earbud from the several shapes and sizes provided. Jawbone's ergonomic design enhances acoustic performance and keeps the device lightweight, stable and comfortable.