It's tough to turn the lights on when your hands are full. But that doesn't mean you need to stumble around in the dark when you come home with your arms laden with groceries, kids, laundry or the myriad accoutrements of modern life. The SensorPlug Motion-Sensing Outlet is a passive infrared motion sensor that's triggered when you walk past, instantly turning on a light or even an appliance, such as a fan or a radio.