A Thatcham device refers to the safety product which has been tested and Accredited by Thatcham Analysis. This may incorporate alarms, immobilisers, or trackers created to prevent theft. Certification means the system meets rigid requirements and is particularly trusted by insurers. An alarm acts as yet another layer of safety https://medium.com/@trackerfit11/why-choosing-a-thatcham-tracker-strengthens-vehicle-security-6b79d8a9c256