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 percent accuracy * Compatible with inverters; designed for use with AC 115-volt appliances * Choose from the Kill-a-Watt"s four settings to monitor your electrical usage * Features easy-to-read screen * Monitor your electrical usage by day, week, month, or year