Over-the-head option for long-term comfort and stability; over-the-ear option for quick on/off and unobtrusive usage. Noise-cancelling microphone. Three different sized earhooks, and adjustable over-the-head headband, and the option of usage on either ear. Lightweight comfort (14g). Supports SoundGuard Plus and Call Clarity technologies for superior sound. Quick Disconnect feature. Adjustable clothing clip.