【Adjustable tension】 The voltage protector can adjust the overvoltage and undervoltage values as needed. Overvoltage protection: 230-300 V adjustable (standard: 270 V), undervoltage protection: 140-210 V adjustable (standard: 170 V).【LED display】 You can clearly and intuitively understand the device's operating status on the LCD screen. The buttons are easy to operate. If the voltage reading is inaccurate, it can be corrected between -20V and 20V.【Function】The smart plug has a built-in 16A magnetic relay that won't burn out due to high voltage surges. When overvoltage, undervoltage, or overcurrent faults occur on the line, the power supply can be immediately cut off to protect electrical equipment from damage.【Easy to install】 The voltage protector features a plug-and-play design, making it quick and easy to use. It can be installed directly on the refrigerator and is very convenient to install. It can also be used as a power outlet.【Wide range of uses】 Voltage protectors can be widely used in refrigerators, air conditioners, water heaters, rice cookers, washing machines, televisions, and other equipment to protect electrical systems from overvoltage, undervoltage, etc.