Is there a GPS in them? How do they know where you are supposed to be and if you stray from that location? Is there a grace period for you to get back inside that location?
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It depends which unit is used.
Some are GPS/cellular based. They call in off satellites. Zones are created around your house, work, etc. Anywhere you go, there’s a point tracking you.
Some are “radio frequency” or RF for short. There is a base station in your house. You’re given a range (50-150 feet) you can go from the base station. There’s no GPS in these. Only “in range” or “not in range.”
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