It plugs into the USB port. There are 2 feet under the key which can switch. It has 3 LED "Num Lock", "Caps Lock" and "Scroll Lock". that can illuminate. This is a classic QWERTY keypad with function keys F1 to F12 and numeric keypad. It works great on a GNU / Linux system. I'm happy with this purchase and would recommend this keyboard to anyone who wants a simple keyboard.