This light runs off an included battery. It has a tiny little slide switch in the base to control the LED bulb.
It is 2-1/2" high and the base is 3/4" wide
LED Lamp. No transformer required. Turn on and off with small switch on Base that contains a CR927 3V battery. Base is magnetized for hanging. The non-replaceable LED bulb will burn for at least 4000 hours. Base unscrews to replace battery with #2300 Four 3V CR927 batteries.