Home Energy Monitor See in REAL-TIME how much electricity your whole home is using! Monitor displays energy use in Dollars and Kilowatts. Historical usage for the past day, week and month. Connect to your computer to monitor anywhere. Kits come with everything you need. Simply install two sensors to your power cables and a wireless transmitter will send usage data directly to the display in real time. Allows you to lower your energy usage - save 15% or more!