Let Bach, Brahms and Mozart help soothe baby to sleep, as classical lullabies combine with soothing bubbles, lights and gentle movement. Swimming fish and sea creatures catch the eye as they move all around the aquarium. The Ocean Wonders Aquarium features up to 10 minutes of soothing songs, with two aquatic sounds and three musical settings: music and sounds; music, sounds and lights; and music, sounds, lights and motion. The product requires 3 D batteries, not included.