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Choose from 10 distinct sound profiles, each with two levels of richness to total 30 different sound profiles, all of which have been scientifically engineered to promote a deeper sleep, relaxation, and renewal. Unlike other "white noise" sound machines, SOUND+SLEEP uses magnificent, naturally recorded, high-definition sounds that are up to 30 minutes in length, eliminating all audio repetition for natural real-world sound environments. Includes a global power adapter kit for worldwide use. It uses a built-in microphone to listen to your environment and dynamically adjust the volume based on ambient noise levels, so you always have the best listening experience