Cherry G84-5500LPMEU-2 G84-5500 Keyboard 88-Key XS Touchpad PS2 Prog Keys Integrated Touchpad - Color Black Single keys with Gold Cross point contacts (CHERRY ML Technology) Designed for continuous use - more than 20 Mio. key operations Integrated Touchpad plus 2 mouse buttons PS/2 connector. Keyboard is NOT USB! Mechanical Keyswitches are Rated at 20 Million Actuations to Withstand Harsh Environments and Ensure Long Product Lifetime