Our Heartbeat Comforters Play Soothing Tunes And Mimic A Heartbeat So Your Baby Can Fall Asleep Peacefully. Choose From A Waterfall Sound, A Heartbeat Sound Or 2 Different Lullabies. You Can Set The Time When The Music Box Stops Playing. It Will Automatically Start Playing Again At The Sound Of Your Baby’S Crying. These Cuddly Friends Will Help Your Baby Feel At Ease And Fall Asleep Quietly.