The comforter on the go is a smaller version to bring with you on the go. The comforter with heartbeat gives your child a safe and calm feeling while on the road. You can easily attach the comforter to the Maxi Cosi or stroller with a string. The comforter comes with a music box with 2 sounds: heartbeat and white noise. Using one large button you can turn on the music box, adjust the volume and switch between the two sounds. Because the button is extra big, the music box is easy to handle, even when it's placed in the comforter.