LED Illuminated Ergonomic USB Multimedia Backlight Backlit Gaming Keyboard (New Red Backlight) Interface: USB Cable Length: 2m Keyboard Weight: 696g Peak force: 55  7gf Multimedia Keys: 6 Keys Weight with Package: 940g Voltage/Current: DC 5V/100mA Travel to peak: 2.5  0.2mm Travel distance: 3.5  0.2mm Switch life: 25 million times Operating humidity 35% to 85 % Operating temperature: -5 to 40 Dimension: Approx.460(L) x 190(W) x 30(H)mm Support OS Windows 98/2000/ME/XP 32bit Vista/Win7 32/64bit/Mac. Package Included: 1 x Aula BEFIRE Blue Backlit Gaming Keyboard