Includes 3 Dohm Classic White Noise Sound Machine in Gray THE ORIGINAL SOUND MACHINE: Beloved by generations since 1962, the Dohm Classic model features our fan-based natural white noise producing our signature sound – the soothing ambient sounds of rushing air, without the disturbance of actual moving air. CUSTOMIZED SOUND EXPERIENCE: With two-speed options for adjustable tone and volume, making it simple to create a personalized sound environment, excellently masking background noise and allowing for better sleep, office privacy, effective soothing for kids and babies, and calming for sound-sensitive dogs.