The Sleep Sound Therapy System from Sound Oasis helps you relax and with soothing sounds. It has a wide choice of sounds like the ocean, rain, rain forest, thunder and more to soothe your mind and body. You can also connect your iPod or MP3 player to listen to your favorite songs. This sleep system display shows the day, date and time stamp along with the volume controls. The integrated speakers let you sleep undisturbed. This sleep system can be powered both by battery or wall outlet. Available with AC/DC power adapter. 4 AA batteries included.