Unlike generalized white noise machines for human ears a canine behaviorist developed the audio tracks to reduce stress in our four legged friends. This device is very effective at masking ambient noise by creating a soothing and calm environment for rest or sleep. White Noise Sound Machine Real Fan Inside White Noise Sound Not everyone likes all the different types of white noise and fan sounds included in these devices so i think it s helpful when there s more variety. White noise devices for sleeping . We spent over 60 hours researching and testing each white noise machine by experimenting with each user interface playing each white noise from zero to maximum volume analyzing each machine s. The rest from hatch baby is a comprehensive sleep system that combines light and sound therapy in a device that can be accessed using any cell phone or other smart device. The marpac dohm is our choice for the best noise cancelling sleeping device available today. There s something ...