Thatcham alarm categories are Cat 1 for alarm and immobiliser, Cat 2 for immobiliser on its own and and Cat 2>1 for alarm upgrade designed to integrate with an existing Cat 2 immobiliser...

Universal Thatcham category 1 alarms come with a pair of high security remote controls that operate the central locking and arm and disarm the alarm. If you prefer to use your existing remotes you can buy a Thatcham category 1 alarm that utilises the cars remotes...

There are two main types of category 2 Thatcham immobilisers, touchkey and transponder. A touchkey Thatcham immobiliser works by inserting an electronically coded key into a receptacle on the dash board...

Thatcham Q class GPS tracking systems will be reclassified by Thatcham in 2007 in a new Thatcham accreditation scheme.