The Logitech USB Headset Stereo H650E, is a binaural (two-ear) headset which combines crystal clear wideband sound and clever productivity-enhancing features for all-day productivity. To help prevent accidental interruptions and acoustic echo cancellation an in-call LED (busy light) lights up during a call. In addition to this, the noise-cancelling microphone helps eliminate background distractions in noisy workplaces for optimum headset communication.