What is Radio-frequency identification system can do?

Answer 1

RF ID = Radio Frequency Identification System. Use a RF ID device:

The RF ID device is a very small integrated circuit chip made up of a Radio transmitter, microprocessor, each chip programmed with either a fixed unique serial number or other unique identifying data. These are now cheap enough that they can be attached to many items, containers or other goods that require identification, even there are special tiny sterile chips can be inserted under your pets skin to help identify him if he gets lost. Special scanners radiate signal to the chips which use the scanners RF signal for powering the Radio Transmitter and the chips Microprocessor, which then transmits a radio signal with the data stored inside it. It could be as simple as a RF ID price tag on goods in a store so the cashier can register the items details and price as its passes over the scanner.