Electricity Usage Monitor Simply plug the power meter between the device and a power outlet, then you can know exactly how much electricity is used by individual items in the house. If you are trying to reduce your electricity bills, this handy gadget will definitely help you! Functional and useful It features a simple user interface with many information settings, including power (W), energy (kWh), current (A), voltage (V), power factor, cost, maximum power, minimum power, etc. to monitor the power consumption of home appliances. Overload Alarm Once the load exceeds 16A or 3680W, there will be a flashing "OVERLOAD" icon on the screen, so you will know which appliance is consuming a lot of power, or in case of problem. This helps a lot in ensuring electrical safety and minimizing losses.Backlit LCD Display The power meter is built with a large backlit LCD digital display which can be seen from a distance and is very easy to read in good light or in darkness.Battery powered, data stored The player itself comes with a small battery which can store the information if you unplug the mains plug. Don't worry about losing your data. Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.