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on 7/5/19The pricing tier that you choose determines how many people are contacted: the higher the price, the more people are contacted.
When you sign up your missing pet, you enter in the last seen address. I believe the Amber alert starts with that general area and works it's way out.
They use address of your neighbors, and if phone is listed. They have multiple packages that go up based on number of phones to contact.
It is based on where your pet is lost and how much area you want to cover.