This is a white noise sleep aid App, it is simple, easy to use, built in a number of high-quality music, users can also choose their own music to play.
White noise refers to sound that maintains a consistent (uniform) frequency within the audible frequency range (20~2000Hz), such as the sound of waves, rain, etc. White noise power Spectral density does not change with frequency. White noise can cover other sounds, but when there is noise around it, it is not easy to hear, known as the masking effect. White noise can mask the sounds of barking, barking dogs, closing doors, honking horns, or traffic outside the window. Therefore, people with insomnia or inability to sleep often listen to white noise to speed up their sleep and reduce interruptions to sleep. Even if awakened, white noise can make it easier for people to fall asleep again.