Manhattan Numeric Wireless Keypad

18 full-size keys including backspace key 2.4GHz RF technology offers wireless freedom with effective range up to 33ft with USB micro receiver Asynchronous number lock function operates independently of computer keypad for faster numeric data entry Auto power management hibernation mode helps maintain proper battery levels Membrane key switches reduce typing noise improve response & provide low-profile keystrokes Ultraslim & lightweight--ideal for notebook computer users Ergonomic design provides support for comfortable use & avoidance of wrist strain Full-sized low-profile keys are easy to identify Plug & play--no drivers or installation required Includes one AAA battery