The new panel mount PM-TB offers solid state, optical trackball technology, in a completely sealed and waterproof enclosure. Featuring NEMA 4X protection, the PM-TB�s 38mm trackball sits inside polycarbonate housings within stainless steel bezels. The trackball is easily removable for convenient cleaning, while an adjustable tension ring ensures the proper amount of trackball smoothness for any user. In addition, the PM-TB features sealed, stainless steel switches, including a programmable button. The PM-TB is ESD-safe, and available with the choice of either PS/2 or USB cables.