This keyboard is a 104 key keyboard with a huge built-in trackball for mousing (51 mm or just over 2 inches in diameter).
The keyboard has tactile (i.e. you can feel the click when the key actuates) mechanical keyswitches rated at 20,000,000 life cycles. The dimensions of the keyboard are 19.1" Long x 6.8" Wide x 1.3" High.
This keyboard comes with a single dual head PS/2 cable for keyboard and mouse, and a USB adapter which permits you to fully use the keyboard with only one USB port.