This product features a professionally finished mechanical trackball measuring 38.0 mm in diameter. Three mouse buttons are located on top of the trackball, allowing you to left-click and right-click to quickly navigate web pages. Designed specifically for harsh environmental conditions, the trackball is made of stainless steel, dust and moisture resistant (IP54), and resistant to mechanical, chemical, and physical influences. It is available with a USB or PS/2 interface. Mounting holes allow for easy internal installation on any equipment, ensuring a more secure installation. It is compatible with Windows and Linux operating systems.