Sound machine soothes crying babies with two sound settings: calming sounds or white noise Custom sounds developed by Pediatrician Dr. Harry Zehnwirth Six Mozart melodies and an MP3 hookup for custom music Nightlight and auto sleep timer that turns off in 60 minutes More than a 90% success rate with crying babies*- *Based on a study conducted by Okidokie LTD Every new parent will tell you: a good night 's sleep is everything. The Sounds for Silence Nursery Premium Sound Machine quickly soothes crying babies with two sound settings: calming sounds or white noise. When tested with crying babies, the sound machine had a success rate of calming more than 90%.* Sound machine features six Mozart melodies and an MP3 hookup for custom music. Also includes custom sounds developed by Pediatrician Dr. Harry Zehnwirth, along with Dr. Zehnwirth 's Baby Settling & Health Guide. Your "good night 's sleep" solution!