The custom-designed pattern on our Breathing Band works with the Pro Camera (sold separately) to safely and comfortably detect your baby's breathing motion in almost any sleep positionwithout any sensors, electronics, or radars! Using patented computer vision technology, Nanit tracks breaths per minute (BPM) and responds quickly to changes by sending real-time alerts through the app and to the camera should your little one need you. Think of it as a gentle hand on your baby's chest when you can't be cribside.