Features Smart Adjusting: Adjustable over and under voltage protection and recovery values, and the action time is also adjustable. Delay Resetting: Supports auto delay reset, both the failure recovery delay time and power on delay time are adjustable. Better Displays: The digital display enables a clear view in the voltage measurement, making the working safe and reliable. Other Functions: This voltage protector is equipped with reset mode selection, fault inquiry and factory reset functions. Easy to Install: Comes with a light weight and a compact size, the simple installation can be quickly finished in minutes. Specification: Item Type: Over Under Voltage Protective Device Material: Flame retardant PC. Rated Voltage: 230V AC Over Voltage: 230-300V Under Voltage: 140-210V Package List: 1 x Over Under Voltage Protective Device Package List 1 x Over Under Voltage Protective Device