Adorox Aurora Master Night Light Ocean Projection Calming Waves Lights Lamp (1 Aurora Master) Aurora Master simulates the calming and entrancing movements of the ocean. Can cover the ceiling of a room about 10 feet wide. Built in speaker will allow for soft, ambient music tones, loud enough to enjoy but not overpowering to interfere with the calmness. Runs on AC power or 4 - AA batteries (screwdriver required batteries NOT included). Auxiliary cable allows you to plug in any device to play music!