White Sound Pro is the best app that can be used freely without downloading additional sound sources by collecting white noise that is known to be effective in many areas such as improving concentration, soothing baby and insomnia. White noise is a mixture of various frequencies, and sounds of nature such as rain, waves, waterfalls, etc. The effect stimulates hearing, relieves tension and gives a refreshing feeling that makes you feel good. Best of all, Easy to hear, neutralizes unwanted no