Compact size for space saving. Key pressure:55g,comfortable feeling,effectively reducing typing stress. Noiseless design for near zero working environment. Dimension:45.5x16.4x2.1cms. Suitable port:PS2/USB. Life:span of operation:10,000,000times. Compatible with windows 98/2000/ME/NT/XP/Vista/Linux/Window 7/Window 8/Window 8.1