The same as Thatcham Class 1 systems, a Thatcham Group 2 machine should isolate at least two circuits or devices, or a single vehicle Regulate unit that’s demanded to the car to operate correctly. Once again, it should be passively set. S5 trackers (Beforehand known as category 5) are Thatcham’s https://medium.com/@trackerfit11/why-choosing-a-thatcham-tracker-strengthens-vehicle-security-6b79d8a9c256