It goes off once or twice a day, and you have 15 minutes to check in once it does. If you miss one, it'll try again a bit later. If you miss the retry, the poli

It goes off once or twice a day, and you have 15 minutes to check in once it does. If you miss one, it'll try again a bit later. If you miss the retry, the police visit to check you're home. It's not checking every 15 minutes!