Review of Wireless electricity monitors from The Blue Line innovations, TED, OWL, Black & Decker EM100B Energy Saver Series Power Monitor, P3 International P4460 Kill A Watt EZ Electricity Usage Monitor. Electricity Usage Monitor is a amazing device, this device will open your eyes to monitor electricity consumption in your home. It will calculate and forecast electricity uses and costs by the day, week, month and even entire year in LCD display by Kilowatt-hour.