Editing Radio-frequency identification (section)

===Readers===
RFID systems can be classified by the type of tag and reader. There are 3 types:<ref>{{cite web|url=https://www.makeuseof.com/tag/technology-explained-how-do-rfid-tags-work/|title=How Does RFID Technology Work?|website=MakeUseOf|date=June 2017|language=en-US|access-date=2019-04-22}}</ref>

* A '''Passive Reader Active Tag''' ('''PRAT''') system has a passive reader which only receives radio signals from active tags (battery operated, transmit only). The reception range of a PRAT system reader can be adjusted from {{convert|1|-|2000|ft|-2}}, allowing flexibility in applications such as asset protection and supervision.
* An '''Active Reader Passive Tag''' ('''ARPT''') system has an active reader, which transmits interrogator signals and also receives authentication replies from passive tags.
* An '''Active Reader Active Tag''' ('''ARAT''') system uses active tags activated with an interrogator signal from the active reader. A variation of this system could also use a Battery-Assisted Passive (BAP) tag which acts like a passive tag but has a small battery to power the tag's return reporting signal.

Fixed readers are set up to create a specific interrogation zone which can be tightly controlled. This allows a highly defined reading area for when tags go in and out of the interrogation zone. Mobile readers may be handheld or mounted on carts or vehicles.