Basler 100 Series Operator Tansformer 120v 60Hz 12V 20 Class 2.

Used tested working, 14v without any load (12 v output with load). See pic.

This mounts up on a regular 110 outlet. And can provide a constant 12 volts AC for items requiring a 12 volt AC power supply. Used on many homes for powering alarm system panels.