Monaural design fits comfortably over one ear 3 in 1 design includes headband, earhook and neckband for 3 different wearing styles Comfortable headband with extra padding; comfortable leatherette ear cushion HD Voice for high quality wideband audio Speaker has HiFi frequency response Noise-canceling microphone reduces unwanted background noise in open office environments PeakStop technology immedicately removes potentially harmful loud sounds or tones before they reach your ears Air Shock microphone reduces unwanted "pops" for better call quality Microphone boom swivels a full 360 degrees Kevlar reinforced cords provides best-in-class durability in call center environments Quick Disconnect (QD) for compatibility with a variety of amplifiers and adapters