Numeric Keypad / Keyboard numeric usb / Keyboard numerik mtech Ultra-thin notebook computers caps design. Aesthetic apearance Durable structure, long life Non-synchronous digital input, no affection to the other keyboard Compatibility IBM PC at MAC Button design 23 bonds Key trip 3.0 + 0.3mm Surcharging Height 0.25+0.05mm Maximum pressure 55+5g Operating temperature 0-55C Key life 800million and above Products size 100*140*15mm System Hardware Requirement PC with USB port Windows 8/Windows 7 Windows Vista/Windows XP Mac OS 10.4 above