Calibrate: hold the red button. Speak Language A for a few seconds, then Language B. The button will show the detected language codes during calibration.
Translate: after calibration, tap once. The green button shows the current source language. Tap again to switch direction.
Stop: double tap the main button. The red button goes silent.
Text size: use + and − in the top bar.
Save: use Save to download the current translation as a text file.
The app displays only the translated text. The original transcript is not shown.