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White noise means that the frequency of a sound is uniform in the audible range, which makes her look closer to a straight line. It is mainly a soft sound in nature, such as the sound of rain, water flow, and ocean waves. Belongs to white noise. White noise has two characteristics, one is to calm emotions, when you are irritable or insomnia, listening to these white noises can calm you down, soothe your emotions and make it easier for you to fall asleep, the other is the masking effect, white noise Can effectively neutralize other noises, thus creating a false quiet. Auto-renewal service statement: 1.1. Payment: VIP"monthly subscription", "quarterly subscription", "annual subscription" will be deducted from your iTunes account after confirming the subscription. 2. Renewal: 24 hours before the expiration of the subscription period, Apple will automatically deduct the fee from the iTunes account. After success, the VIP subscription period will be automatically extended by one subscription period (please ensure that the App is connected to the Internet when renewing). 3. If you need to cancel the automatic renewal, please go to the phone system "Settings - Apple ID - Subscription" to cancel at least 24 hours before the subscription expires. Privacy Agreement:https://sites.google.com/view/sleep-privacy-policy VIP Service Agreement:https://sites.google.com/view/vip-service-agreement Auto-renew Agreement: https://sites.google.com/view/auto-renew-agreement