Features include:

* In-app game ROM download;
* Game state: save and load;
* On-screen controls that can be customized;
* Supported gamepad controller;
* Bluetooth - wifi multiplayer.
* Play retro games easily & Update game frequently

This application does not include any ROMs which must be provided by the user. It can open files from external storage (such as USB drives and SD cards) as well as internal storage using Android's storage access mechanism.
This app is just an emulator.