Volume Booster.

-The app makes audio, music,video volume louder up to 10 times
-The app supports builtin music audio video player

Volume Booster Premium
We currently offer the following auto-renewing subscription option:
- $5.99 per week
- $7.99 per month

By subscribing you get unlimited access to effects and remove advertisement.
Payment will be charged to iTunes Account at confirmation of purchase. Your subscription will automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current period. Subscriptions may be managed and auto-renewal may be turned off by going to the Account Settings after purchase. No cancellation of the current subscription is allowed during active subscription period.
• Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable

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