This app is designed to randomly pick Bingo numbers and display called numbers. You can mirror to an Apple TV, output to a projector via HDMI, share the app window to a group video app, or just show it on from your computer display. App can run full-screen or windowed. You can auto-pick numbers by clicking Auto Pick or click and unclick numbers chosen from your Bingo ball picking cage. The app can optionally say the numbers aloud. Controls are simple. Once the external display was set up, two special needs friends used the app to run a Bingo game with no issues.