ImmobiTag is a radio frequency identification device (RFID) designed specifically to be embedded into a bike's frame. Each tag contains a unique serial number that can be read by the Police, making the bike, registered owner's details and the bike's status viewable directly on their systems.
The ImmobiTag comes with full instructions. On the back of the packaging it explains how to fit the tag and activate it online. This can be done at www.immobilise.com 
The tag emits a unique Radio Frequency Identification number that is registered online during activation of the tag.
How does electronic bike tagging work?