This is the device that generates 145 soothing authentic nature sound combinations to help you drift asleep. The device has 24 primary sounds (such as ocean surf and spring rain) captured in the field and they can be combined at the touch of a button with soothing sounds such as song birds or thunderstorms for up to 145 combinations. Incorporating years of neuroacoustic research, the device has the same sound technology used by hospitals to help people sleep better. The sounds can be set to gradually slow down to lull you to sleep and automatically turn off in 30-, 60-, or 90-minute intervals. Two integrated speakers and a subwoofer produce clear, full treble and bass. Includes a backlit digital clock with an AM/FM stereo and three alarms. 8 1/2" L x 6 1/2" H x 5 3/4" D. (2 1/2 lbs.)