High quality membrane tactile key switch Multi-language version available,Ergonomic design Operation force: 60+/-10g / Power key operation force:80+/-10g Operation life: 10 millions Power rating:5V,50mA max Operating temperature:-5C-50C Key numbers:Standard 104 keys/Multimedia 12 keys Flat surface and ultra slim multimeadia keyboard profession plunger key structure design power management:"Power" "Sleep" "Wake up" PS/2,USB,U+P Ports Windows 98/2000/Me/XP compatible 1.Operating force of keyboard standard Key Top:55+/-12g 2.Operating force of keyboard Hot Key:65+/-12g 3.Travel Length of Keyboard Standard Key Top:4.0+/-0.2mm 4.Travel length of keyboard Hot Key:2.6+/-0.2mm 5.Keyboard:465mm(L)x189mm(W)x18mm(H) Caution:Avoid prolonged use of the keyboard.Take regular breaks and keep a good posture.Consult your physician promptly if you notice and loss of motion or pain in your wrist when using the keyboard.