This application is a friend of ear buds, a headset,

This app automatically recognizes your earphones and headset and notifies you in the status alerts. And when you tap the notification window, this app will launch.
This application is a music player, video player, such as dialing earphones to run the application.
This application is Controller other Apps,
This application is " frequently used apps " can be used.

Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.