The app connects to the text display WiFi network and displays a local website with the song lyrics.
To use the app, WLAN/WiFi and location services have to be enabled.
Hints:
From Android 8 upwards the location have to be activated so that a WiFi connection can be managed via the app. Therefore, the authorization question for the device location comes up during installation and you have to allow it (precisely when using the app). The location is not queried by the app and we do not collect any user data through the app.
If the song lyrics fail on Samsung devices, then disable the following setting.
Android Settings-> Connections-> WLAN/WiFi ->
Intelligent Wi-Fi -> Detect suspicious networks