Brand new 24V 5A 4000 mA center tap AC transformer.
Input is 110V/220V.  Output is 12V + 12V.
You get 24V by using the two blue wires.
If you need 12V you can use one blue and one black wire.

Dimentsions:

W 70mm (100mm with mounting tabs)
H 60mm
D 60mm

Weight is 2 lb 1.5 oz

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.

Free shipping in the US by first class mail.