Features Comprehensive Electrical Measurement: Accurately measure voltage, current, active power, and energy with this versatile device, ensuring optimal performance for your electrical systems Overload Alarm System: Stay informed with the built-in overload alarm, featuring flashing backlight and power indicators to alert you of potential issues before they escalate Customizable Alarm Thresholds: Easily set your desired power alarm threshold to suit your specific needs, empowering you to monitor energy consumption effectively User-Friendly Backlight Feature: Activate the intuitive backlight with a simple key press, designed to remember its state for seamless use even after power interruptions Large LCD Display: Enjoy clear visibility with a spacious LCD screen that simultaneously showcases voltage, current, power, and energy parameters for comprehensive monitoring Features: 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、Backlight function, short pr 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、Display interface is large-screen LCD, it can display voltage, current, power, energy parameters at the same time. Specification: Features: Electrical parameter measurement function (voltage, current, active power, energy). Overload alarm function (over power alarm threshold, backlight and power flashing to alarm). Power alarm threshold preset function (can set power alarm threshold). The reset function of energy key. Store data when power off. Backlight function, short pr 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. Display interface is large-screen LCD, it can display voltage, current, power, energy parameters at the same time. Specification: Brand: PEACEFAIR Model: PZEM-021 Working Voltage: 80~260VAC Test Voltage: 80~260VAC Rated Power: 20A/4500W Operating Frequency: 45-65Hz Measurement Accuracy: 1.0 grade 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 Weight: 84g(approx.) Package Includes: 1 x Meter Package List