Dohm classic sound machine Fan-Based White Noise 2 Speed Adjustments Adjustable Tone 7 foot 120V AC power cable Give sleep a chance with the original sound machine. First invented in 1962, the Dohm was initially called the Sleep-Mate (or Sleepmate) and has been beloved by generations since. The classic model features our signature fan-based natural white noise with two speed options for adjustable tone and volume. Just plug it in, flip the switch to high or low, then rotate the cap and collar to find the best sound for you.