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This Kill-A-Watt Electricity Monitor Model P4400 can help you cut down on electricity costs by determining how much power is used by various appliances. Plug this device into a three-prong grounded wall outlet, plug your appliance, computer, lamp, or other electrical product into the monitor. You can see the kilowatt hour consumption of any item to learn how much it costs to run. Cycle through kW, volts, amps, watts, Hz and VA on the LCD display. Measures with 0.2% Accuracy.