Features 1、Power meter can only measure active power, it does not display apparent power. If you measure the power of a DC‑AC inverter, make sure it is a pure sine wave. Otherwise, the meter may be burned or melted. 2、Its clear large screen can display voltage/current/active power/accumulated electric energy/frequency/power factor at the same time. 3、The backlight can be turned on/off manually, making it easy to read in the dark or strong light. 4、When the preset power value is exceeded, the backlight and power figures will flash. 5、This button is used to control the backlight, reset energy data or preset battery alarm thresholds. Specification Item Type: Power Monitor Material: GFR Nylon Current: 0.00~100A Power: 0.00~22000W Power Factor: 0.00~0.99 Electricity: 0.01~99999KWh Frequency: 50HZ/60Hz Product Size: Approx. 90x54.5x28mm / 3.5x2.1x1.1in Package List 1 x Power Monitor 1 x English Manual