Our address only iButtons are designed to be used as a serial number device. They contain on-board ROM (Read Only Memory) that safely stores identification serial numbers without fear of the IDs becoming corrupted. iButtons, therefore, can be used as a physical password and username all in one. Different applications include:
Secure change purse for electronic payment at local transit systems, payphones, parking systems, or vending machines.
It can also be used in photo ID badges and printed circuit boards
Link an employee ID to the iButton serial number to view who accessed a secured area