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 cotside. Monitors baby?s breath so you can catch a breath. Features: No sensors, electronics, or radars Real-time alerts sent to the Nanit Pro Camera (sold separately) and the app Breathing motion detected in almost any sleeping position Made of soft, 100% cotton that?s machine-washable and dryer-safe Fits comfortably over most pyjamas and sleep sacks (up to 24 months) 100% Machine Washable Dryer Safe 100% Cotton 1 Year Manufacturer Warranty Dimensions: Size: H60 x W13 x D0. 5 cm Weight: 0. 53 kg