Best answer: Nano:Tiny
Small USB receiver that comes with the Keyboard/mouse set. No set up--just plug it into the USB on the computer and turn on the mouse and Keyboard--don't remember if there were pull strips to activate the batteries or if the batteries had to be installed. Once the receiver is plugged into a USB port only about 1/4" X 3/8" is visible. We can leave ours plugged in all the time. If you need the USB port--there is a receiver storage pocket in the battery compartment of the mouse.
Sidenote: I already had a wireless Logitech mouse. The keyboard would not connect to that first wireless receiver. Everything was fine when I switched to the receiver that came with the keyboard--mouse combo.
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