1、Voltage Display: This overvoltage protection device has overvoltage protection, undervoltage protection and voltage display function (voltage measurement). 2、Manual Adjustment: In order to provide security protection for electrical appliances (not included) or other devices, you can manually adjust the overvoltage, undervoltage, and overcurrent protection values. 3、Multifunction: Our current protection device has reset mode selection, fault inquiry, and restore factory function. 4、Secondary Protection: Our overvoltage protection device can prevent frequent on and off of unstable voltage from causing additional damage to the appliance and achieve secondary protection. 5、Flame Retardant PC: Our overvoltage protection device is made of flame retardant PC material with exquisite craftsmanship, which can achieve long term use.