efergy® Wireless energy monitor. The Efergy elite classic wirelessly sends information on energy usage to the display monitor. Simple and easy to install, the monitor updates every 6 seconds to accurately track where energy is being used. No need to add a separate meter base to monitor multiple suites in your home. Compact, portable display can be placed anywhere in the home. Displays daily average. View your real time energy consumption. View historical data on energy usage (cost, CO2 and kWh). Audio alert if you exceed your set maximum consumption target.