I have been using this app for two years.It give 15 days trial and after 15 days automatic lock this app.The value of poweramp is 68 rupees in this time.Once bought, it becomes free forever.It has full equaliser and different frequency.Power has full bass and treble.There have a function to next it twice.We can change both songs and music folders.It also provides many types themes.I will always like this app.