The dual-tariff electricity meter is used to measure the electricity consumption of household appliance and calculate electricity costs. The product has built-in rechargeable battery, for the newly purchased device or the device that has not been used for a long time, please connect the power supply for charging. If the display and the key reaction are unusual, you can press the "RESET" key to reset the system. After the reset, all data is reset to 0, you have to reset the parameters. Power Meter Socket Backlite can be customized to meet the standards of Germany, Britain, Australia, the United States, France, Italy, Israel, Belgium, Denmark, South Africa, Brazil and other countries Installing the batteries Install 3.6V rechargeable Battery (NI-MH) . The purpose of the batteries is to store the total electricity a…