Usage Tips:Features: Fully automatic overvoltage and undervoltage protector is suitable for single phase AC voltage 230V, 50/60Hz, rated working current 63A and below users or loads. It is mainly used for the protection of over-voltage, under-voltage or over-current in the distribution line of residential household box or the protection of single-phase power equipment. Its main feature is that the line has overvoltage or undervoltage, overcurrent condition, the product can cut off the power supply instantaneously, protect the electrical equipment from being damaged; when the line voltage returns to normal, the protector can automatically turn on the power supply Automatically. Specifications: Item Type: over/undervoltage protector Material: Plastic Over voltage: 230~300V (adjustable) Undervoltage: 210~145V (adjustable) Size: approx.36x85mm/1.42x3.35in, 65x45mm/2.56x1.77in Color:White Quantity: 1 Pc Note: No retail package. Transition: 1cm=10mm=0.39inch. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 x Over/Undervoltage Protector (other accessories demo in the picture is not included.)