Energy meter. Calculates the energy used by plugged devices and appliances. Plugs into a regular 120-V plug and displays voltage (V), current (A), wattage (W) and power factor that are being used on an LCD screen. Keeps track of maximum wattage and total of energy consumption (KWh) and operating time of attached appliance(s). 1 or 2 prices of electricity can be entered to calculate the total cost of electricity used. Includes button cell batteries for memory protection. Rated for 120V AC/15 A and maximum resistive load of 1,800 W. White.