A new device will tell you exactly which appliance is sucking up all your electricity, said David Talbot at TechnologyReview.com. Sense is an orange box about the size of an eyeglasses case that connects to your home's electrical service panel. The device reads incoming power levels a million times per second, allowing it to identify the distinct power "signature" of appliances like garage door openers, toasters, and microwaves. (Courtesy image) Sense sends the data it collects to the cloud for analysis, and then displays it on a smartphone app.