Hammond model CV1201200 isolation transformer / constant voltage / electrical noise suppression line conditioner for 120vac at 1200 W. It is completely isolated - the secondary has no connection to the primary. It has surge / transient suppression and comes with a 14 gauge 15 ft power cord. Caution... this is a big, heavy duty industrial unit. The Hammond specifications say that due to the normal operating noise it is not suitable for an office environment, so don't put it in the living room next to your sound system. Put it in the basement or another room. I bought these to use with my emergency generator. It's about 75 lbs - local pickup only please. This is unit #3.