Help with Identifying a part

Thread Starter

shurbs123

Joined Dec 6, 2019
1
Hi Forum,
Can you help me identify (see pic attached) please?
Size of a £2 coin, sticky on one side ( the silver circuitry side) black plastic on the other , thickness of paper , number 5 and ta written on???
What is it , what are they used for ?
Regards

g
 

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Chris65536

Joined Nov 11, 2019
139
Looks like an RFID tag. A reader powers and activates it with a kHz frequency, and the tag sends out its serial number on a different frequency.
 
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