Manhattan Keyboard(176354) 19 full-size keys including backspace key Asynchronous number lock function operates independently of computer keypad for faster numeric data entry Scissor (X-structure) key switches reduce typing noise, improve response & provide low-profile keystrokes Number Lock LED indicator Windows 2000/XP/Vista/7 compatible USB cable, 89 cm (35 in.) 19 full-size keys including backspace key Ultra slim and lightweight C ideal for notebook computer users