Stancor model GISD-250 115V/230V isolation transformers, 1500V RMS test voltage, rated 250VA. These transformers are new/old stock and are all in new or very good condition. They were stored in a sheltered outdoor location for an extended period and some have very slight surface corrosion but are otherwise in new condition. Details for the GISD250 transformer are available here. Approximate dimensions: 4"x5"x5", about 10lbs.