https://developer.android.com/about/versions/kitkat.html “Android HCE emulates ISO/IEC 7816 based smart cards that use the contactless ISO/IEC 14443-4 (ISO-DEP) protocol for transmission.”

http://www.acs.com.hk/en/product-lines/6/contactless-readers/

ACR122U USB $45

http://www.ebay.com/itm/White-NFC-ACR122U-RFID-Contactless-Smart-Reader-Writer-Mifare-IC-Card-New-/400683189440?pt=US_Cell_Phone_Replacement_Parts_Tools&hash=item5d4a9444c0

Nexus 5 can read/write * NTAG203 NXP

Car2Go Card