S5, the highest Thatcham category, incorporates Automatic Driver Recognition (ADR). This feature requires an authorized driver to carry a tag, card, or smartphone with an encrypted app to identify themselves. S7 trackers, the lower category, lack this feature. An S5 tracker provides alerts in more theft scenarios compared to an S7 tracker. Apart from driver recognition, both S5 and S7 systems share basic features like 24/7 control room monitoring, internal backup battery, and protection against towing or lifting. Additionally, all S5 and S7 trackers (except Tracker Monitor and Tracker Retrieve) come with a dedicated smartphone app for various functionalities.