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2. Contactless smart card - Wikipedia

   en.wikipedia.org/wiki/Contactless_smart_card

   Contactless smart card. A contactless smart card is a contactless credential whose dimensions are credit card size. Its embedded integrated circuits can store (and sometimes process) data and communicate with a terminal via NFC. Commonplace uses include transit tickets, bank cards and passports. There are two broad categories of contactless ...

3. Smart card - Wikipedia

   en.wikipedia.org/wiki/Smart_card

   While first generation Complex Cards were battery powered, the second generation is battery-free and receives power through the usual card connector and/or induction . Sound, generated by a buzzer, was the preferred means of communication for the first projects involving Complex Cards.

4. Square (financial services) - Wikipedia

   en.wikipedia.org/wiki/Square_(financial_services)

   It accepts credit card payments by connecting to a mobile device's audio jack. The original version consisted of a read head directly wired to a 3.5 mm audio jack, through which unencrypted, analog card information was fed to smartphones for amplification and digitization. [41] Square Reader also supports Apple Lightning on post-2018 products.

5. Proximity card - Wikipedia

   en.wikipedia.org/wiki/Proximity_card

   A passive proximity card for door access. A proximity card or prox card[1] also known as a key card or keycard is a contactless smart card which can be read without inserting it into a reader device, as required by earlier magnetic stripe cards such as credit cards and contact type smart cards. [2] The proximity cards are part of the ...

6. Radio-frequency identification - Wikipedia

   en.wikipedia.org/wiki/Radio-frequency_identification

   Passive tags are powered by energy from the RFID reader's interrogating radio waves. Active tags are powered by a battery and thus can be read at a greater range from the RFID reader, up to hundreds of meters. Unlike a barcode, the tag does not need to be within the line of sight of the reader, so it may be embedded in the tracked object.

7. FeliCa - Wikipedia

   en.wikipedia.org/wiki/FeliCa

   FeliCa is externally powered, i.e. it does not need a battery to operate. The card uses power supplied from the special FeliCa card reader when the card comes in range. When the data transfer is complete, the reader will stop the supply of power. FeliCa was proposed for ISO/IEC 14443 Type C but was rejected.