Logitech USB Headset H540. Plug into high-performance audio for PC calls, music, and more. Simply insert the USB and instantaneously experience crisp, digital stereo and crystal-clear calls.Laser-tuned drivers and built-in equalizer for precision audio. USB-A plug-and-play connectivity lets you instantly enjoy music, movies, and calls in rich, digital stereo sound. On-ear controls and mute indicator light make it easy to see when the mic is muted.