The SH 330 IP Monaural Wideband Headset from Sennheiser is a single-sided headset that is convenient for use during longer conversations. This wideband headset delivers a more nuanced soundscape where voice transmission is perceived as warmer and more natural. It can be used for VoIP communication via softphones on PCs / MacBooks and IP desk phones. The noise-canceling microphone is designed to filter out ambient noise. The single-sided wearing style allows you to hear what is happening around you. The SH 330's adjustable boom allows the microphone to be positioned accurately to achieve optimal speech clarity. The acoustic foam ear pad optimizes sound penetration around the center of the cushion and into the ear canal while minimizing leakage. The ActiveGard technology is designed to protect you from acoustic shock in the event of sudden sound surges. This silver headset comes with two acoustic foam ear pads, a carry bag, a cable/clothing clip, two leatherette ear pads, and a microphone windscreen.