product feature X Scissor lift key construction,comfortable Color:Black products weight:170GR Keypad size:14*12*1.6cm extended layout,contain Esc,Tab, Back Space, Delete, Home, End Prt sc keys, Page up, Page down keys and four arrows direction keys Short-cuts to calculator functions. Powerful system identification chip, which can automatically adjust some key functions of the keypad to match the operating system of the connected computer. In Windows OS:Prt sc/calculator/Left Parenthesis/Right Parenthesis In Mac OS:F13/F14/F15/F16 OS:Windows XP or above, Mac OS, PC to USB port Package included: 1 x 34 keys wired numeric keypad 1 x manual