[intuitively monitor the power consumption and understand the cost] the power consumption meter can measure the power (W), volt, ampere, frequency, power factor, maximum and minimum power (W), cumulative time and energy (KWH), and automatically calculate the cost; Monitor your home's energy use to help you save on electricity bills [large clear LCD display with backlight] kilowatt meter of power monitor has wide viewing angle and digital display; Easy to read and operate in dark areas, electric display, LCD display with clear backlight. [long term data storage and memory function] built in rechargeable battery backup. When the watt meter power analyzer is powered off or unplugged from the socket, it can save data for up to 90 days; All data, including cost settings, can reach zero once the reset button is pressed. [only 1 socket can be used] compact size; When the power meter socket plug is inserted into the upper socket, the lower wall socket is available; Made of high-quality fireproof materials; Friendly warranty and after-sales service for 1 year; Note: it is incompatible with AC inverter and solar inverter. [3680w overload indication] this power monitor can measure 110-130 VAC and 200-240 VAC voltages (Note: the label on the back of the watt meter only shows the low voltage range of 110-130 VAC); 0-16A AMP; 0-3680w power and indicates overload when the load is up to 3 680W; Class 1.0 accuracy standard, 0.1W, 0.1V, 0.001a and 0.001kwh resolution