Numeric Keyboard Product Size: 18.5*9*1.9CM Numeric Keyboard1)USB Connector2) Operation system. Win95(PS/2),Windows 98,98 SE,Windows ME,Windows NT 4.0(PS/2),Windows 2000,,Windows XP,MacOS8.6,MacOS9.0,MacOS X3)17keys,0-9 number keys,+,-,*,/,Del,Entr4)operation temprature. -10°C -- 50°C,5)humidity limit. ≤85% RH6)Material. ABSProduct Size: 18.5*9*1.9CM Numeric Keyboard