P3 P4400 Kill A Watt Electricity Usage Monitor Large Lcd Counts Consumption By The Kilowatt Hour Connects To Household Appliance & Assesses Its Efficiency Calculates Electrical Expenses By The Day, Week, Month Or Year Checks The Quality Of Power By Monitoring Voltage, Line Frequency & Power Factor Dim: 5.13"h X 2.38"w X 1.63"d Electricity usage monitor connects to appliances and assesses efficiency Large LCD display counts consumption by the kilowatt-hour Calculates electricity expenses by the day, week, month, or year Displays volts, amps, and wattage within 0.2 - 2.0percent accuracy Compatible with inverters; designed for use with AC 115-volt appliances