Leeo turns conventional smoke detectors into internet-connected smart devices—thus providing upgraded capabilities without requiring an expensive home overhaul. First, it plugs into any outlet. Then, using sound, it monitors a home’s existing smoke and carbon monoxide detectors and alerts users when they go off. If you don't respond, Leeo automatically calls your emergency contacts so someone else can address the problem. Adam Gettings, Leeo’s co-founder, says the nightlight is just the first in what will be a series of connected devices designed for regular people. At a point where connectivity, processing power, and sensor technology are mature enough to really solve problems in the home, Gettings and company are looking to figure out the next challenge: making it all useful to people who don’t like futzing with technology.