Enter Standard USB Keyboard E-KB503U SPECIFICATION > Standard 104 Key Slim Keyboard > PS2 / USB Interface > Plug & Play, No Driver Required > 10,000,000 Keystroke Button Life > Maximum Rating: +5.0Vdc±10%, 200mA maximum > Contact Resistance: 500 Ohm maximum > Insulation Resistance: DC 100V 50M Ohm minimum > Compatible: Window 95/98/ME/NT/2000/XP