1Backlight Display: This power meter has a clear backlight display, allowing for clearer and more visible display of data both during the day and at night. 180 wide viewing angle, perfect for reading and recording data from any angle. 2Overload Guard: When the power of the electrical appliance exceeds the overload power, the LCD will display overload to warn the user. All buttons will stop working and can only work when you lower or remove the load power supply. 3Data Storage: When you remove the power meter from the socket or the electrical appliance from the electricity meter, the meter will record your power consumption data. Next time you use it, you can directly see the final data, and automatically save it in case of a sudden power outage. 4Parameter Monitoring: The power meter plug can test the power (W), energy (kWh), V, A, Hz, power factor, cost, minimum and maximum power, cumulative days and time of the electrical appliance. Switching between 7 display modes, convenient and practical. 5Secure Material: The casing of the power meter is made of excellent PC material, which is secure and fireproof, has strong toughness, heat resistance, erosion resistance, and long service life. 1 xPower Meter 1 x User Manual