Modern ones use both GPS and 4g cellular, with a fiber optic strap that alerts if it’s tampered with. They need to be charged daily because they have live tracking.
You can have them set to an inclusion zone (only stay in this area, eg your house) or an exclusion zone (don’t go near these certain areas) or both. If you beach the zone your PO is notified and they can try to contact you, if they can’t get in contact they issue a warrant on the spot.
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