Das Keyboard 4 Professional is designed with best-in-class, Cherry MX Blue switches that have clicky tactile bump when the activation point is hit. The combination of the tactile feel, the psycho-acoustic experience and incredible craftsmanship all deliver an experience like no other. Sleek design, laser-etched key caps, and oversized volume knob make this one beautifully crafted machine. The most advanced mechanical keyboard on the market today.