Each tag has a unique serial number and can contain other programmable information. The information contained in a tag can be transmitted to a reader. In most cases, the reader radiates a low power RF signal to the tag, causing the tag to respond with its serial number. Because the RF signal powers the tag, no batteries are necessary the tag never wears out. Since RFID tags can be read without contact, they can be imbedded in a variety of different form factors.
Manufacturers can create tagged credit cards, key tags, watches, and more.
More in-depth information regarding RFID can be found on the AIM website . AIM is a trade organization for the Automatic Identification and Data Capture industry.