AVS5D Automatic Voltage Switch is a power protection device combining over-voltage under-voltage lightning & spikesurge protection for your appliances & electronics This device also guards against surges & spikes that may occur when power is restored The AVS5D easily handles small refrigerators small freezers small air conditioners TVs & computer equipment plugged into its single outlet from fluctuating power Program buttons let you quickly set voltage range onoff delay overload protection & digital display mode The easy to read digital LED displays show you voltage wattage settings & status at a glance The AVS5D features surge protecting components to guard against spikes & surges