Travel-size sound machine designed to provide the most realistic, natural sounds to help facilitate relaxation and/or sleeep; Features Adaptive Sound Technology that automatically adjusts volume based on noise levels; Twelve (12) distinct sound profiles including ocean, rainfall, white noise, and much more; Sleep timer can be set to 30, 60, or 90; AC powered and can also run on two (2) AA batteries (not inclued); 3.5mm headphone jack; One year warranty