The First Years Dream-in-sight Baby Mobile offers quite time play during the day and a dreamy light show at night to help soothe baby to sleep. This baby mobile helps developing visual tracking skills of your baby and plays four musical selections. It attaches to the baby cot easily and securely. The mobile projects colourful shapes for soothing sleep time and cute characters rotate for fun daytime. The music box can be used separate for an older baby. Nature Sensations Dreams In Sight Baby Mobile requires 3 AAA and 4D Batteries which are not included.