dreamcaster by sharp sound machine alarm clock with bluetooth speaker, 6 high fidelity sleep machine soundtracks – white noise machine for baby, adults, home and office – blue led sharp dreamcaster by sharp sound conditioning alarm clock is a sound machine with bluetooth speaker with white led display. fall asleep to your choice of 6 different soothing sounds - 3 scientific “color” sounds, and 3 water feature relaxation sounds. featured sounds include: white noise, pink noise, brown noise, rain, thunder, ocean. white noise is sometimes described like a radio tuned to an unused frequency. similar to the way white light contains all the wavelengths of the visible spectrum at equal intensity, white noise has equal power across all frequencies audible to the human ear. pink noise has reduced higher frequencies than white noise. it resembles the sounds of steady rainfall or wind and is often considered to be more soothing than white noise, which some people find unpleasant. several studies on pink noise have shown that sleeping with it can improve our memories the following day, and potentially even long-term. brown noise lowers the higher frequencies even more than white noise or pink noise. it’s been said that it resembles the roar of a river current or strong wind. common benefits associated with brown noise are relaxation, improved focus, and of course, sleep improvement. the sharp dreamcaster sound machine alarm clock also features 3 additional water sound features: ocean, thunder and rain. each of these sounds are high quality reproductions of the water sounds of nature, and are a great source for relaxation, security and comfort.