1. Real time monitoring - real-time measurement and calculation of power (W), energy (kWh), current (A), voltage (V), frequency (Hz), carbon dioxide emissions (kgCO2), power factor, cost, maximum power supply voltage, power, power factor, frequency and carbon dioxide equivalent. You can also view these cumulative data by day, week, or month. 2. Double rate and single rate - The double rate mode is added. You can set two rates at different times as needed to calculate the electricity bill more accurately. 3. Overload alarm - you can set the security alarm power supply (no more than 3680W). When the load connected to the socket exceeds the set value, the large LCD will flash "Overload" to warn the user. It helps to control the power consumption of electrical equipment and ensure electrical safety. 4. Data retention - With the built-in battery, the latest data will be recorded even if the instrument is disconnected from the socket. Don't worry about data loss caused by sudden power failure 5. Parameters - Voltage: 230V AC 50Hz, maximum current: 16A, maximum power: 3680W, accuracy: 2 percent , operating temperature: 0 ° C-40 ° C. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.