More sleep, less crying. Features (3) different sounds - shushing, heartbeat and white noise Timer will automatically turn off the unit Soft night light can glow solid or pulse Battery operated, portable and perfect for on-the-go use Requires (2) AA batteries. The Munchkin Shhh... Portable Sound Machine was made to give parents a break and designed with science in mind. Babies don't need. Features (3) different sounds - shushing, heartbeat and white noise. Timer will automatically turn off the unit. Soft night light can glow solid or pulse. Battery operated, portable and perfect for on-the-go use. Requires (2) AA batteries.