The Resting Up with Heart Beat positioner is a big step up from the Resting Up with our patented heart beat sensation. It has three easy settings: Normal mode creates heart beat vibrations for 10 minutes before fading; Listening mode will be still until baby cries, then turn on for 10 minutes before fading; Combo mode begins in Normal, then fades to Listening mode and turns on when needed. Comes with two adjustable, removable wedges filled with our AirCare Foam and covered with FloThru fabric. The mat is filled with AirCare Foam to maximize breathability and contours baby with a layer of FloThru fabric designed to minimize sweating. Endorsed by Dr. Hahn. * Fully adjustable sleep positioner * Inclined surface gently elevates baby to help reduce reflux and aid digestion * Battery operated heart beat vibrations soothe baby to sleep * Breathable wedges help reduce overheating * Breathable mat contours baby’s head and back to maximize air flow * Easy to use reminding system to show which direction to face baby’s head * Easy to clean and machine washable