Tracking your home's energy use has obvious benefits — but doing so has typically required complicated, potentially dangerous installation steps. The Glow Smart Energy Tracker makes it easy. Its wireless tracking unit uses magneto-resistive sensing to measure your home's energy consumption directly from your meter box, yet installs in just seconds with no wiring required. That data is sent to the in-home unit, which processes it and uses its top-mounted light that changes colors from green to red depending on your current usage. It'll also send you a notification if it notices extended high usage, like if you left the oven on or the fridge door open, and can even help you set and hit energy usage goals.