The app plays sounds that can help you louder speakers. The app can scare away dogs and mosquitoes. The app can generate audio frequency ranging from 0 to 20,000 Hz. Subscription pricing and terms: This app offers an auto-renewing weekly subscription at $4.99 pre month,$19.99 for six months to provide unlimited access and other premium features. Payment will be charged to the credit card connected to your iTunes Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and the cost of the renewal will be identified. You may manage your subscription and auto-renewal may be turned off by going to your Account Settings after the purchase. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable Privacy policy: https://soundmachine892922587.wordpress.com/privacy-policy/ Terms of use:https://soundmachine892922587.wordpress.com/terms/