Usage Tips:Description Description Description REAL-TIME MONITORING - Measure and calculate power (w), energy (kWh), current (A), voltage (V), frequency (Hz), CO2 emissions (kgCO2), the power factor, cost, maximum supply voltage, power, power factor, frequency and CO2 equivalent in real time. You can also view this cumulative data by day, week or month. DOUBLE TARIFF AND SINGLE TARIFF - Added dual tariff mode, you can set two electricity tariffs at different times as needed to calculate the electricity costs more accurately. OVERLOAD ALERT - You can set the power of the security alarm (not to exceed 3680W). When the load connected to the socket exceeds the set value, the large LCD will flash OVERLOAD to warn the user. It helps you control the power consumption of electrical equipment and ensure electrical safety. DATA RETENTION - With the built-in battery, even if the meter is unplugged from the outlet, the latest data will be saved. Dont worry about data loss due to sudden power failure. PARAMENTS - power voltage: 230V AC 50Hz, maximum current: 16A, maximum power: 3680W, accuracy: +/- 2%, operating temperature: 0C - 40C. Product size: 16.5*8.3*7.7cm . Shipping quantity: 2 pieces.