- 权限 （安全）
M.A.R.V. helps you keep your phone volume levels at the levels you choose at the time you choose.This app will let you set up alarms that change the various volume levels on your phone. Create as many alarms as you'd like. Set the Media volume, the Alarm volume, and the Ringer volume of your phone. Also has easy to use sliders that allow you to manually set the volume at any time.