Plays 15 different melodies and sounds to create a calming sleep environment for your baby Offers three interchangeable projection plate themes, including Soothing Sea, Starry Night, and Peaceful Forest, to add a magical touch to their room Sound-activated option responds to your baby's cries and helps to soothe them back to sleep during naptime and throughout the night Auto shut-off after 60 minutes saves battery life Requires three AA batteries or a micro-USB input (not included)