You might know RFID as the technology that Big Brother uses to track your every move. Quickly, don the tinfoil hats!!
Only kidding. RFID is useful for sensing and identifying tagged people and objects for access control, automation, and a whole range of different applications. This basic RFID tag works in the 125kHz RF range and comes with a unique 32-bit ID. It is not re-programmable. This blank, smooth, and mildly flexible RFID tag is ready for your logo (or hand-drawn scribble).
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They are just the size of a credit card and fit perfectly in a wallet. They also work at a pretty decent range, and do their job well.