NFC is a wireless communication
technology which enables the user to interact with their surroundings by
touching their phone to a RF ID tag. The tags require no power as the
phone activates the tag when it is within 2 centimetres.
NFC uses ISO/IEC 14443 and communicates
via magnetic field induction operating at a radio frequency of 13.56 MHz
using loop antennas. The tags in the sign are passive and are only
activated by the loop being completed by the equivalent antenna in the
NFC mobile phone. This takes around 0.3 seconds.
| 
