The PC 3 Chat stereo headset delivers high quality audio while its passive noise-canceling microphone ensures clear conversation. Plug-and-play dual 3.5 mm jacks get you online on your PC in a moment. This lightweight on-ear headset is designed for comfort and the rigors of daily use. Sennheiser PC 3 CHAT Noise Cancellation - Sennheiser sound clarity, superior noise cancellation and comfort.