Create a relaxing environment anywhere with the HoMedics Sound Spa Portable Sound Machine. Six different digitally recorded natural sounds mask distracting background noises allowing for better relaxation and sleep. An auto-off timer lets you run the Sound Spa machine for 15, 30 or 60 minutes at a time, while the lightweight, compact size makes it perfect for travel. Operate the Sound Spa machine with a power cord adaptor or 4 AA batteries (batteries are not included). Packaging may vary, but product contains the following sounds: ocean, summer night, rain, thunder, brook and white noise.