Rev A number printed between the prongs on the back of the base.
overall: 2 7/8 in x 2 1/2 in x 3 3/8 in
There is a "Safety Checked" sticker on top. There is a Texas Instruments logo on the front. There is a wall plate mounting bracket on top. At the back, there is a standard 2-prong American power connector. At the bottom, there is a cable ending in a 4-prong female connector. It says "Warning: To avoid electrical shock or fire, do not interconnect secondary windings."