Brand new 12V 5A 5000 mA center tap AC transformer.
Input is 110V/220V.  Output is 6V + 6V.
You get 12V by using the two blue wires.
If you need 6V you can use one blue and one black wire.

W 102mm (4") with tab (70mm without (2 3/4"))
H 60mm (2 3/8")
D 70mm (2 3/4")

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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