The Fisher-Price Ocean Wonders Deep Blue Sea Bouncer is a chair that soothes baby with the wonders of aquatic sights and ocean sounds! The Fisher-Price Ocean Wonders Aquarium Bouncer features four selections of music & sounds: lullabies, ocean waves, summer rain and babbling brook. While in the bouncer, baby can bat at the seahorse and fish to activate music, lights and fun sounds. Or she just sits back in the chair and watches the bubbles and fish in the aquarium. Four "D" (LR20) alkaline batteries are required.