WattZDog Power Saver 1200-M Connect to Breaker Box. 220 Volt, 20 Amp The device is a whole house surge protector and electricity saver. The Wattsdog Power Saver 1200 units designed to lower energy bills Increases motor and appliance life and surge protect all your equipment inside of your house. Residential customers should see a savings of 10% to 35% on their electrical usage