Nument Portable Wireless Numeric Keypad Keyboard for Notebook MacBook The notebook Portable Wireless Numeric Keypad use 2.4G frequency band for wireless connections within 32.8FT?Eliminating the data line problems?The keys feel soft and comfortable Refined and compact design,the usb wireless keypad internal storage USB receiver, 1.5X1.5CM area matte keys, even easier to use, integration of the threading hole, very convenient to carry This is a low power keypad,Use AAA battery, low power consumption design, when the battery voltage is lower, LED lights can provide an indication The battery can be used at least two to three months, NUM active the keypad in Windows OS;Support the mainstream operating systems in market, such as Windows XP/Vista/7, MAC IOS, Do not need to manually install the driver