We found this in a utility closet humming away happily but not connected to anything. The building it is in is being decommissioned as an office, so we have no need for it. Here are the specs if anyone is interested in it. Sola Electric Constant voltage transmitter harmonic neutralized type CVS input 95-130V 60 Hz 6.1 amps output 120V 500VA It measures 16" long, 8.5" wide and 8.5" high.