1. Electrical parameter measurement function (voltage, current, active power, energy)

2. Overload alarm function (over power alarm threshold, backlight and power flashing to alarm).

3. Power alarm threshold preset function (can set power alarm threshold).
4. The reset function of energy key. 
5. Store data when power off.
6. Large-screen LCD (display voltage, current, active power, energy at the same time)
7. Backlight function.

Appearance and Key function
I. Display Interface
Display interface is large-screen LCD, it can display voltage, current, power, energy parameters at the same time, as shown in figure 1

II.Display format
1. 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.
2. Energy: test range: 0~9999kWh
   Within 10KWh, the display format is 0~9999Wh;
   10kWh and above, the display format is 10~9999kWh.
3. Voltage: test range: 80~260V
   Display format: 80~260V
4. Current: test range: 0~20A
   Display format: 0.00~20.00

Key
1. Backlight control
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.

2. 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.

3. 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

Precautions
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.

Specification parameters
1. Working voltage: 80 ~ 260VAC
2. Test voltage: 80 ~ 260VAC
3. Rated power: 20A/4500W
4. Operating frequency: 45-65Hz
5. Measurement accuracy: 1.0 grade

Package List:
1pcs x Digital LED Power Panel Meter