This app sends you a notification when a Sentry even is observed by your car. So, instead of waiting to get in the car to see the sentry notifications on the the car console, you get a notification on your iPhone/iPad as soon as the car detects a Sentry event.

You can enable and disable these notifications per car.
The app supports multiple cars (no per-car purchase is necessary). Specifically, it supports all cars that are linked to your account.
The app does not require a subscription.