Hi @rbrptl - Watt Check runs independently from device detection. It’s intended to help you learn about your home and find opportunities to save quickly, regardless of whether the light you’re checking has been detected already. Keep in mind, Sense needs to see devices in their usual context with their regular usage patterns and on/offs to be able to accurately identify them. That means that training by turning devices on/off and labeling them, unfortunately, would not be very effective. That being said, we’ve introduced several features that take user inputs (besides you using your devices, of course) into account for our device detection algorithms. Features like renaming mystery devices, re-categorizing devices and adding make/model to a device’s details are different ways that you can contribute to device detection. In addition, integrations like smart plugs and Phillips Hue can net immediate detections for connected devices. You can learn more about the challenges of implementing a “learning” mode here: Why can't you train Sense?.