The PM-2000-TB is constructed using a highly-rugged stainless steel case and industrial silicone rubber pad, ensuring NEMA 4X protection in extremely rugged applications. The PM-2000-TB provides users with a full 114-key industrial keyboard and trackball industrial pointing device. It has two rows of function keys that allow for single keystroke access to software shortcuts. The laser trackball pointing device is integrated into the keyboard for additional usability. Features: 10-Key Numeric Pad 114-Key Functionality 24 Function Keys Integrated Trackball PS/2 and Separate-Cable USB configurations available - See more at: http://www.ikey.com/product/pm-2000-tb/#sthash.gXCJblPu.dpuf