This wireless PowerCost Monitor™ looks like a digital clock and even tells time, but it was actually developed to save you as much as 20 percent on your electric bill. Main displays include real-time electricity costs for your house, peak usage over a 24 hour period, a disk emulator showing the same rate as your outside meter, signal strength and battery-level indicators, total amount spent on electricity, and an outside temperature reading and a digital clock. No electricians necessary. It's easy to install. Simply program in your home's electricity rates, install the sensor unit to your meter within a 100 ft. transmission area, and you'll get power readings in dollars and cents, as well as in kilowatt hours. Compatible with electromechanical, digital/solid state, AMI, AMR and smart meter types. Runs on four AA batteries (included).