WeDJ for Android is available free of charge from Google Play.
https://play.google.com/store/apps/details?id=com.pioneerdj.WeDJ&hl=en_US&gl=US

Please refer to the Hardware diagram below for the functions controlled by DDJ-200.

Hardware diagram for WeDJ for Android

Supported wireless system: Bluetooth Low Energy (MIDI standard compliant)

*Pioneer DJ does not guarantee normal operation of all types and models of smartphone and tablet.
*Before purchasing DDJ-200, please test the Android device you use with WeDJ for Android to make sure the application properly works with your Android device.