Shaker is a gesture detector, available for devices with Android 4.1 Jelly Bean and above.
With Shaker, you can choose to perform an action triggered by a gesture done with your device. You can choose between different actions and gestures, and have multiple gestures set at the same time.
Permissions:
-Licensing (for checking if the user bought the app)
-Sensors (to listen for gestures)
-Boot (to start the service when the device boots)