Feature: 1. Power alarm threshold preset function (can set power alarm threshold). 2. The reset function of energy key. This module is suitable for indoor use. 3. Display interface is large-screen LCD, it can display voltage, current, power, energy parameters at the same time. 4. Short press the key to turn on or off the backlight, the backlight has memory function, it can store the on or off state when power off. 5. The instrument has the characteristics of precision and stability, small size, easy to carry. Specification: Condition: 100% Brand New Item Type: Digital AC Meter Material: ABS Color: As shown in the picture Display Screen Size: Approx.51x30mm/2x1.2in Overall Size: Approx.89.6x49.6x24.4mm/3.5x2x1in(L x W x T) Power: Test Range: 0~4.5kW within 1KW, the display format is 0.0~999.9W. 1KW and above, the display format is 1000~4500W. Energy: Test Range: 0~9999kWh Within 10KWh, the display format is 0~9999Wh. 10kWh and above, the display format is 10~9999kWh. Voltage: Test Range: 80~260V Display Format: 80~260V Current: Test Range: 0-20A Display Format: 0.00-20.00 Working Voltage: 80 - 260VAC Test Voltage: 80 - 260VAC Rated Power: 20A / 4500W Working Frequency: 45-65Hz Measurement Accuracy: level 1.0 Weight: Approx.83g/2.9oz Backlight Controlling: Short press the key to turn on or off the backlight, the backlight has memory function, it can store the on or off state when power off. Reset Energy: Step1: Long press the key for 5 seconds until the number in energy display window flash, then release the key. Step2: Short press the key again, then the energy value is cleared and exit the reset flashing state.If you don't want to clear, then long press the key for 5 seconds until the number doesn't flash, it means the energy value is not cleared and will exit the reset state. Set power alarm threshold Step1: Long press the key until the LCD screen display “SET CLr”, then release the key to enter the setting state Step2: Power window display the current power alarm value and the last digit begin to flash, then you can short press to plus 1, when there is no operating over 3 seconds, it will switch the digit position automatically, the setting method is as same as the above. Step3: After finish the setting, long press the key over 5 seconds will store automatically and exit, the range of active power threshold is 0.0~4.5kW . Package List: 1 x Digital AC Meter1 x Instruction Manual Note: 1. This module is suitable for indoor, please do not use outdoor.2. Applied load should not exceed the rated power.3. Wiring order can't be wrong.