Numeric Keyboard supports NumLock, ESC, Tab, Delete, etc. With a shortcut key that can open the computer calculator directly. The Muli-Function 22 Keys Wireless external number keypad for a laptop is more unique than most keyboards. Our Number Pad is only 87g. And Numeric Keyboard works with 2.4GHz wireless technology, Plug, and Play. You can just plug the receiver into a USB port. No device drivers are needed, no delays and dropouts, and fast data transmission. The maximum working range is up to 32.8 ft. The Receiver is inserted in the battery compartment of the keyboard. Made of high-quality ABS material which offers great comfortable touch and precise control, good resilience fast response, and reduces the press sound. It also has an auto-sleep function, lower power consumption reflects energy saving. Press any key to wake up the keypad. Power Supply by 2 x AAA Battery ( not included )