The Baby Brezza Sleep & Soother Sound Machine is a fully adjustable sound and light machine that helps your baby drift off to sleep and stay asleep. The sound machine comes with 18 soothing sounds including white and brown noise, heartbeat, rain, stream, lullabies and more. Equipped with a built-in nightlight with 3 brightness levels and a fully adjustable timer for sounds and nightlight - choose from continuous or 30, 60 or 90 minutes, with auto shut-off. Also perfect for on-the-go with its small and lightweight design that fits in the palm of your hand. Use with 4 AAA batteries (not included) or a USB cord.