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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Modern ones are basically a cell phone without a screen. They have GPS, they have a battery, they have a wireless data connection. There are older ones that are basically a proximity monitor where you need to be within a certain distance at certain times.
Some older ones may still be in use. I would imagine most places have moved onto the “cellphone without a screen” devices because they offer far higher accuracy and can track people basically anywhere.
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