This IP65 keyboard with 16 Numeric keys is made of Stainless steel with a backlight. It employs the short stroke 0.45mm, gold-on-gold key switch technology and has a protective covering of metal dome PCB with a casing and top panel mounting made of stainless steel. It works on the standard voltage of +5V DC +/-5% and on a appr. 20mA EMC current reading. It is compatible with all current Operating Systems like Linux, Mac OSX, Unix, all variations of Windows. Also compatible with PS2 Interface,it supports RS485, RS232 and USB ports. It works on 9600bps communication velocity. It is Vandal proof and has all the necessary keys like Enter, Backup, Cancel, Clear and the numbers from 0 to 9.