1Support for overload alarm function, exceeding power alarm threshold power flashing alarm. 2Support for power alarm threshold preset function, you can set the power alarm threshold by yourself. 3Support for electrical parameter measurement function, measuring voltage, current, active power and energy. 4Support for energy button clear function and support power-down data saving function (save power before power-down). 5Support for highlight red LED display function, display voltage, current, active power and power. 6Support for serial communication function, with TTL serial interface, can communicate with various terminals through the adapter board, read and set parameters. 7The display consists of four four-digit bright red digital tubes for displaying voltage, current, power, and energy parameters. Condition: 100% Brand New Item Type: Multifunctional Tester Model: PZEM-004 Display Format: Power Test Range: 0~22kW 0~10kW, the display format is 0.000~9.999 10~22kW, the display format is 10.00~22.00 Energy Test Range: 0~9999kWh 0~10kWh, the display format is 0.000~9.999 10~100kWh, the display format is 10.00~99.99 100~1000kWh, the display format is 100.0~999.9 1000~9999kWh and above, the display format is 1000~9999 Voltage Test Range: 80~260VAC, Display Format is 110.0~220.0 Current Test Range: 0~100A, Display Format is 00.00~99.99 Working Voltage: 80-260VAC Test Voltage: 80-260VAC Rated Power: 100/22000W Working Frequency: 45-65Hz Measurement Accuracy: 1.0 Product Size: Approx. 12 x 6 x 3 cm / 4.7 x 2.4 x 1.2 in Weight: Approx. 170g / 6oz Method of Clearing the Energy: Press and hold the clear button for 5 seconds until the battery display window flashes digitally, then release the button. Press the clear button again, the energy data will be cleared and the clear flashing state will be exited, and the clearing is completed. If you press and hold again for 5 seconds until it stops flashing, it will exit the clear state. border: .5pt solid000;};border: 1px solid000important;}1 x Tester1 x Split-core Transformer1 x Chinese English User Manual1. This module is suitable for indoor use and cannot be used in outdoor.2. The applied load cannot exceed the rated power.3. Wiring can't be wrong.