Description: 【Material and Size】: The Over and Under Voltage Protector is made from flame retardant material for security assurance with product dimensions of 6cmx9cmx4cm. 【Digital Display】: This Voltage Protective Device features a digital display function that shows real time voltage and current, allowing users to watch the condition of the power grid conveniently. 【Auto Reset Function】: The Voltage protector will automatically cut off the power supply when there is an abnormality in grid voltage or current. Once the fault is cleared, it will automatically recover the power without manual intervening. 【Over and Under Voltage Protection】: Users can set overvoltage and undervoltage protection thresholds as needed. If the grid voltage exceeds these set ranges, the protector will automatically cut off electricity to protect your appliances. 【Overcurrent Protection】: You can also set an overcurrent protection threshold according to your needs. When the grid current exceeds this value, the protector will automatically cut off electricity to protect your electrical devices. Size Chart: 6cmx9cmx4cm/2.36inchx3.54inchx1.57inch Package Includes: 1 Voltage Protector Note: Please allow slightly errors 1-2cm differences due to manual measurement.