Near-field and radio-frequency identification

Radio-frequency identification, abbreviated RFID, uses a reader and a tag to obtain an identifier or related information through radio communication. Near-field communication, abbreviated NFC, supports close interaction between compatible devices or tags. Staff can use an appropriate tag to resolve an object reference or register a deliberate encounter.

A visitor presents a phone near the camera's tag and opens its permitted account. A reader near a shelf may detect a tagged possession under tested conditions. The detected reference and an inference about handling are different claims. Staff need to understand the chosen device's reading conditions, missed detections, multiple tags, association with physical placement.

Attachment requires a custodial decision. The tag can remain removable, concealed, visible, or separate from the possession according to the use. Identifiers and addresses explain the record reference. Object sensing examines actual changes rather than treating a tag read as a complete interaction history.