Class one delivers the highest standard of security with both equally alarm and immobiliser features put together. Group two supplies only an immobiliser, which nonetheless helps prevent the vehicle from commencing without authorisation. Equally are passively set and present great safety versus theft. Also generally known as stolen motor vehicle https://medium.com/@trackerfit11/why-choosing-a-thatcham-tracker-strengthens-vehicle-security-6b79d8a9c256