Beloved by generations since 1962, the Dohm is the original white noise machine. The Uno model features our signature fan-based natural white noise producing the famous Marpac Sound the soothing ambient sounds of rushing air, without the disturbance of actual moving air or other irritations. With a single-speed option and adjustable tone, the Dohm Uno makes it simple to create a personalized sound environment. Just plug in the Dohm Uno, flip the switch, then rotate the collar to find the best sound for you. Let the noise-masking magic happen for a natural sleep aid, office privacy, baby soothing, tinnitus relief, respite from noisy snorers and unfamiliar hotel rooms, and a relaxing calming balm for barking dogs.