This 3 hours pink noise at 400 Hz provides a soft, balanced sound environment for deep relaxation and sleep. The black screen reduces visual distractions, allowing your mind to slow down and rest.Pink noise is known for its warmer, smoother sound profile, making it ideal for stress relief, anxiety reduction, and calm focus.Frequency: 400 HzDuration: 3 HoursScreen: BlackNo visuals.No talking.Just soft sound that stays.Brown Noise Sleep SoundsSound that stays.