Das Keyboard Model S Professional Click Pressure Point Mechanical Keyboard (DASK3MKPROCLI) - Manufacturer Refurbished N-key rollover USB 2.1 hub Media Controls German-engineered, gold-plated, mechanical key switches (Cherry MX Blue). Designed to withstand 50 million key strokes Special Media Keys: sleep, brightness +/-, mute, volume +/-, eject, play/pause, next and previous track