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 position-without 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 crib side.