BEST PROTECTION: The wall surge protector protects against high and low voltage, brownout, spike, instant surge, power failure, voltage fluctuation and load sheddingLED Indicator & Delay Function: When the voltage is too high or too low, the DELAY indicator will turn on to show the status. The appliance will be delayed for 3 minutes to confirm that the voltage is stable so that it can be re-establishedUSAGE: The whole house surge protector is great for air conditioners, freezers, ice makers, washing machines, ovens, microwave ovens, dishwashers, coffee machines, bread machines, water heaters, and electric fans, etcAdjustable Voltage Regulator: The minimum and maximum voltage capacities of the wall outlet surge protector are adjustable. Adjustable between 170V and 265V according to your needs. The adjustable position is in the backSAFETY: Once the voltage returns to normal, the SAFETY CYCLE will light up before it turns to green, the green light will turn on which will allow the current to flow while waiting for 3 minutes