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Alert Screen (on-device)

Shows a large, hard-to-miss warning screen on the monitored person's screen — a heading, one line of text and a single button — and can play a ringtone, flash the screen and vibrate to get their attention.

Best for: reminding the person, right on their phone, to head back home.

Details​

Edit Alert Screen form with default heading, dismiss button text, and auto-dismiss timeout

Options​

  • Custom title text
  • OK button text
  • Auto-dismiss after (1–600 seconds, default 60)
  • Screen flashing (on by default — turn it off for anyone sensitive to flashing lights)
  • Custom ringtone
  • Sound volume (0.0–1.0)
  • Vibration on alert (off by default)

Permissions​

On Android 10 and newer the Alert Screen needs Display over other apps (and, on Android 14 and newer, Full-screen alerts). They are what let the alert open by itself when the app is closed or in the background. Without them the alert shows only as a notification that has to be tapped. Sentinel Circle asks for them when you save the channel and again before Start Monitoring.