16 Keys IP65 dynamic washable vandal proof stainless steel industrial compact format numeric keypad with IP65 static 38.00mm mechanical trackball module with 400 DPI resolutions,Industrial metal dome PCB with gold-on-gold key switch technology with short stroke 0.45±0.05mm with excellent tactile feeling for stable and accurate data input, 3 mouse buttons designed for right & left clicking and scrolling up and down with ball rolling, Rear stainless steel plate with mounting holes for rear panel mounting.With dual USB interface and metal box on the back of keypad. Customized Layout is available.