All products reach: FCC, CE& UL standard Mini-numeric keyboards Asynchrony system function 19keys & convenience Every language is available Connector: USB Usage: Handiness Keystroke lifetime: Over 10000000 times System requirement: Windows 98/2000/NT/ME/XP/VISTA Working temperature: -20?C-45?C Working humidity: 10%-90% Keystroke pulling power: over1kg Key switch elasticity: 55+/-7g Every keyboard in any color is viable