Brand new 24V 4A 4000 mA center tap AC transformer.
Input is 110V/220V.  Output is 12V + 12V.
You get 24V by using the two green wires.
If you need 12V you can use one green and one black wire.
In the primary input side you use black and blue for 110V and black and red for 220V.

Measurements are:

55mm height
55mm depth
110mm width and 83mm center to center for the holes.

This is an AC transformer and the output is AC also.
If you need DC you need a power supply not a transformer.
If you try to measure the output using the DC setting in your meter it would not give you a voltage.
You need to set it to AC in order to measure the output voltage.

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