U-Key

{{Orphan|date=March 2017}}

Image:U-key.jpg

A U-Key is an implementation of the MIFARE RFID chip, encased in a plastic key style housing. It is used as a prepayment system on vending machines{{cite web|url=https://microtronic.ch/de/produkte/ukey%7Cutag/systemukey|title=U-KEY system features|website=Microtronic|access-date=24 Feb 2019}} and for some self-service diving air compressors{{cite web | url=http://www.luftverbund.ch/ | title=Schweizer Luftverbund }} in Switzerland, and they will be most likely made by Selecta (company).