Description: Measurement and monitor the electrical parameters(voltage, current, kwh, watt). Overload alarm function(more than watt alarm threshold, backlight flashing). Power alarm threshold preset function(can set up their own power alarm threshold). Power(kwh)button reset function. When power off ,store the data, when on ,continue the date. Large screen LCD liquid crystal screen full display function(voltage, current ,kwh,watt). Backlight function. Specification: 1. Power Measuring Range: 0~2kW Display formats less than 1kW: 0.0 to 999.9W Display format more than 1kW: 1000~2000W 2. kWh Measuring Range: 0~9999kWh Display formats less than 10kWh: 0~9999Wh Display formats more than 10kWh: 10~9999kWh 3. Voltage Measuring Range: 6.5~100V Display formats: 6.50~99.99V 4. current Measuring Range: 0~20A Display formats: 0.00~20.00 KWH measurement is nonvolatile with power interruption. It can be reset to zero via reset button. Operating Temperature: -10℃ ~65℃ Operating Humidity: 10~85% RH You can turn on/off the blue back light manually. Material: ABS plastic Specification parameter: operating voltage: 6.5～100VDC Test voltage: 6.5 ~ 100VDC Rated power: 20A/2000W Measurement accuracy: class 1.0 Package Includes: 1 Piece LCD Panel DC Power Meter (2 Pack) Note: 1. Suitable for indoor ,not outdoor 2. should not exceed te rated power 3. wiring can not be wrong