[Masks Noise] Environmental and nature tracks that can cancel out distracting sounds. Can help improve sleep, focus, privacy, and relaxation. [64 Non-Looping Sounds] 16 Categories to choose from with 4 richness options per category totaling to 64 unique sounds. Rich & immersive sound categories include: Rainfall, Ocean, Brook, City, Baby, Rides, Home, Crowds, Meditate, Small Fan, Large Fan, White Noise, Pink Noise, Brown Noise, Waterfall, and Meadow [Adaptive Sound Technology] Technology that listens and adapts to your environment. It responds to the changes in sound and instantly adjusts the audio volume and mix.