3. Product Layout____________________________
The Android system uses the following keys:
1) Volume keys: the buttons on top , Volume- to adjust the volume.
2) Power key: To turn on and off of the unit or by short pressing it to enter or leave
the standby mode.
3) Menu button: Displays the menu items (if any).
4) Home button: Back to the home screen
5) Return: Return to previous screen.
