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How can I tell if my Ankle Bracelet is GPS or Just a curfew monitor? - ankle bracelet symbolism

I was on an ankle bracelet, the system today, accompanied B1 9000 is connected to the phone line ... My curfew is 7-7 and my anklet is a small black thing with the number 467268A in him, but that's all I have, or do not see any phone or something ... Is this just to be sure to keep my curfew?