Easy to install and use, very convenient. Made of high quality material, solid, durable, high hardness, wear resistance, high precision and high pressure resistance, long service life. Adjustable range that over voltage value range 221V-300V, and under voltage value range 219V-150V, over current value 1-40A. It will automatically turn on the power supply when the circuit voltage and current returns to the normal. It will cut off the power when the circuit has over-voltage, under-voltage or over-current, efficiently protect your household appliances. Dual LED display the real voltage and current values,also can be used as a voltmeter and ammeter, easy and clear to read. Adjustable Over and Under Voltage Protector,SVP-916 40A 63A 80A Over Under Voltage Protection Limit Current Dual Display Surge Protector Automatic Adjustable Voltage Relay Adjustable Over and Under Voltage Protector,SVP-916 40A 63A 80A Over Under Voltage Protection Limit Current Dual Display Surge Protector Automatic Adjustable Voltage Relay Package includes: 1x Over Under Voltage Protection Specification: Material: ABS, electronic components Rated Voltage: 220V Optional Rated Current: 40/63/80A Over Voltage Range: 221V-300V (adjustable) Under Voltage Range: 219V-150V (adjustable) Note: 1.Due to the light and screen difference, the item's color may be slightly different from the pictures. 2.Please allow 1-3cm differences due to manual measurement.