Get real-time info on your electrical usage and track spending. Display Type: Digital, Battery Required: Yes, Battery Type: AA, Battery Included: No Installs on electrical meter and transmits information wirelessly to in-home receiver/display Appliance function provides baseline energy usage, allowing user to track energy usage changes Predictive feature provides actual energy consumption and estimates future energy use, measured in dollars or kilowatt hours Sleep function provides longer battery life when unit is not in use