This Android app connects with Mazatron all-in-one STEM-BOT which can be configured to run different bots based upon the selection
The app should will work in conjunction to the Mazatron STEM Bot only.
The app is available on playstore as Mazatron STEM BOT
For more details visit mazatron
Note
If you would just like to test and tweek the app then all you need is a HC-05 Bluetooth Module,
it looks like this (I guess):
Just Power ON this device and connect to it with your phone's bluetooth and then use it with the app, although this would work but a better approach would be to connect it via arduino and then use it with the app and view data pushed on the serial monitor.