Get maximum sleep relaxation and renewal with the Tranquil Moments Bedside Speaker & Sleep Sounds. It has been based on the DELTA, ALPHA and THETA brainwave system which gives you those deep states of sleep relaxation and enables a perfect rest at the end of the day. The brain will try to match the rhythms of the sound you hear on this speaker and coax you into an ideal sleep you desire. Just twist the dial to choose any tune...