Sennheiser PC 7 USB - Mono USB Headset for PC and MAC USB plug & play - simply plug in to your PC or Mac USB port and start phoning over the net. Connectivity Technology: Wired Light and comfortable - with the lightweight headband, it's easy to forget you're wearing a headset Noise canceling clarity - thanks to the noise canceling microphone, your voice is easily understood without you having to shout Keep one ear free - ideal at home or in the office, the single-sided design keeps you in touch with your surroundings while you talk over the net Peace of mind - thanks to the 2-year international warranty; Connectivity Technology: Wired USB