Size: (2) PiecesElectronic surge protector, specially designed to protect washing machines against lightning strikes and other power overload situations. It will automatically cut power to protect your appliance when voltage surge is detected. The delay period indicator turns on when the is first plugged to the power outlet or after a power outage. It starts a 3 MINUTES time delay to allow stabilization of the system. PLEASE WAIT 3 minutes before you plug in your appliance the first time you use this unit.