You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
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Yes people requested an easier, quicker way to turn Sentry mode on when leaving their car than going into the app, so the on screen button was added in response. Found it to be very responsive and quick On. Still use my app when I can to deactivate so I'm not causing an alert event on my way back into the car.