Features:Electrical parameter measurement function(voltage, current, active power, energy).Overload alarm function (over power alarmthreshold, backlight and power flashing to alarm).Power alarm threshold preset function (canset power alarm threshold).The reset function of energy key. Store data when power off.Backlight function, short press the key toturn on or off the backlight, the backlight has memory function, it can storethe on or off state when power off.Display interface is large-screen LCD, itcan display voltage, current, power, energy parameters at the same time.Specifications:Brand: PEACEFAIRModel: PZEM-021 Working Voltage: 80~260VACTest Voltage: 80~260VACRated Power: 20A/4500WOperating Frequency: 45-65HzMeasurement Accuracy: 1.0 gradePower Test Range: 0~4.5kW (within 1KW, thedisplay 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 is10~9999kWh.)Voltage Test Range: 80~260VDisplay Format: 80~260VCurrent Test Range: 0~20ADisplay Format: 0.00~20.00Weight: 84g(approx.)Package Includes:1 x Meter