Choose your settings. Download config.js, replace the file with that exact name in this extracted folder, then refresh your source. This page works locally; it does not upload your settings.
Preview changes restart the timer. Zero minutes shows READY WHEN YOU ARE. Display sources are intended for 16:9; set 1920 × 1080 or 1280 × 720.
Copy the text below into config.js using a plain-text editor. Keep the .js extension.