The Near Field Communication (NFC) Forum has published operating specifications for four tag types, or integrated circuits that store data and are readable by NFC-enabled devices. An example of such devices would be a mobile phone capable of conducting remote financial transactions or interfacing with any object containing an embedded NFC tag—like touching the phone to a movie poster containing a tag and viewing a preview on the phone's display. According to NFC, standardizing tag types promotes interoperability across the NFC market, abetting low-cost volume production. The four tags address ISO 14443 Type A and B standards and Sony’s FeliCa Referencing ISO14443A. Type 1 tags will be read/re-write capable and user-configurable as read-only. Memory density is 96 bytes, expandable to 2 KB, and transfer speed is 106 kb/s. Otherwise similar to Type 1, the Type 2 tags have an initial memory density of 48 bytes, also expandable to 2 KB. Complying with the X 6319-4 Japanese Industrial Standard, also known as FeliCa, Type 3 tags are pre-configured to be either read and rewriteable, or read-only. Memory varies up to a theoretical limit of 1 MB per service. Operating speed is either 212 kb/s or 424 kb/s. Complying with ISO14443A and B standards, Type 4 tags are preset as either read and rewriteable, or read-only. Memory varies up to 32 KB per service and speed is up to 424 kb/s. To see the specifications are available free of charge, visit www.nfc-forum.org/specs.