Adaptive Sound Technologies LectroFan High Fidelity White Noise Sound Machine: Black $26.78, White for $28.96

Provides ten fan sounds and ten ambient noise variations, including white noise, pink noise and brown noise
Helps mask disruptive environmental noises so you or your little one can fall asleep with ease. 12 inch cord length
Safe, solid-state design is powered by AC or USB and dynamically creates unique, non-repeating sounds with no moving parts
Precise volume control allows you to set the perfect level for your unique environment. 1dB increment control for 10x quieter –10x louder than fan machines
Also ideal for creating a disturbance-free work area, or just reducing the distracting effect of outside noises for a more relaxing environment, day or night