1、Better Displays: The digital display enables a clear view in the voltage measurement, making the working safe and reliable. 2、Smart Adjusting: Adjustable over and under voltage protection and recovery values, and the action time is also adjustable. 3、Delay Resetting: Supports auto delay reset, both the failure recovery delay time and power on delay time are adjustable. 4、Other Functions: This voltage protector is equipped with reset mode selection, fault inquiry and factory reset functions. 5、Easy to Install: Comes with a light weight and a compact size, the simple installation can be quickly finished in minutes. 1 x Over Under Voltage Protective Device Item Type: Over Under Voltage Protective DeviceMaterial: Flame retardant PC. Rated Voltage: 230V ACOver Voltage: 230-300VUnder Voltage: 140-210V