Electronic surge protector, specially designed to protect refrigerators up to 27 cu. Feet against lightning strikes and other power overload situations. It will automatically cut power to protect your appliance when a voltage surge is detected the delay period indicator turns on when the enigmatic is first plugged into the power outlet or after a power outage. It starts a 3-minute 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. Protects against high and low voltage, brownout, spike, instant surge, power failure, voltage fluctuation, and load shedding. High voltage shutoff (135 V AC), and low voltage shutoff (90 V AC). Recommended for domestic refrigerators, ice makers, and air conditioners up to 5000 BTU light indicators for normal, high, low voltage, and time delay. SKU: ADIB07JMLSZFW.