* Simulate the System Back, Home and Recent Button.
if the physical buttons of your phone can not use properly, Back Button can let you continue use your phone with simulating the system button.

* Any combination you want.
you can use Back, Home or Recent independently, or any combination you want.

* Drag or Pin it.
the back button can be dragged any where your want.
you can pin it and disable the dragging.

* Custom theme
You can set the button color, pressed color and the background color. and you can also make the button with transparency.

* Vertical and Horizontal
The button layout can be vertical or horizontal

Accessibility Service Usage.
Back Button requires accessibility service permission in order to enable core functionality. The application will not read the sensitive data and any content on your screen. In addition, the application will not collect and share the data from accessibility service with any third-party.