GUARANTEED NON-LOOPING SOUNDS: Provides 10 Fan Sounds, 10 White, Pink and Brown Noise Variations, and 2 Ocean Sounds - calm and surf. Helps block disruptive environmental noises so you can fall asleep with ease Safe, solid-state design is powered by AC or USB and dynamically creates unique, non-repeating sounds with no moving parts Precise volume control, an optional timer, and a 3.5mm connector for headphones or a portable speaker to match your environment and sleep style Also ideal for creating a disturbance-free work area, or just reducing the distracting effects of outside noises for a more relaxing environment, day or night