Classification 1 gives the highest volume of protection with the two alarm and immobiliser functions combined. Group 2 presents only an immobiliser, which however stops the vehicle from starting with no authorisation. Each are passively established and provide fantastic safety towards theft. Thatcham Investigate, an independent automotive safety overall body, https://directmysocial.com/story5187883/the-single-best-strategy-to-use-for-thatcham-approved-trackers