Get in Touch
Get a Quote
The best keyless car theft tracker for fleets that need more than location data is Thatcham S5 Plus from Crystal Ball, because it adds immobilisation when the authorised fob is absent. Thatcham S5 suits Automatic Driver Recognition (ADR) without immobilisation, and Thatcham S7 suits monitored recovery support. No tracker stops every theft, so the right choice depends on the risk you are managing in 2026.
- Thatcham S5 Plus is the keyless car theft tracker to pick when you need immobilisation as well as monitored location.
- S5 adds fob-based Automatic Driver Recognition (ADR) and alerts, but does not immobilise the vehicle.
- S7 suits monitored security and recovery support, with no ADR, fob or immobilisation.
- No tracker guarantees prevention, recovery, insurer acceptance or lower premiums. Check requirements before you buy.
Why keyless and key-cloning theft changes the tracker question
Two theft methods drive most of the concern around modern vehicles. Both attack the vehicle’s own key system rather than the lock or the window.
Keyless relay theft uses a device to extend the signal from a genuine key fob. If the key sits inside a building or a driver’s bag, the signal can be passed to the vehicle, which then unlocks and starts as though the key were present. The thief never touches the real key.
Key cloning and key programming work differently. A thief copies or programs a replacement key, often through the vehicle’s diagnostic connection, and then drives away with a key the vehicle accepts.
In both cases the vehicle believes an authorised key is present. A standard GPS tracker can tell you where the vehicle went afterwards. It does not change who the vehicle accepts as a driver.
That is the gap immobilisation addresses. A tracker with its own authorised fob adds a second check that sits outside the vehicle’s factory key system.
What makes the best keyless car theft tracker
Use these criteria before you read the table.
- Immobilisation: does the tracker act when the authorised fob is absent, or only report afterwards?
- Automatic Driver Recognition (ADR): does the system recognise an authorised driver through a fob?
- Monitoring: is the vehicle monitored professionally, and is that monitoring priced separately?
- Thatcham category: does the verified category match what your insurer or buyer requires?
- Installation: is professional installation included, and is it available nationwide?
- Honest limits: what the product does not do, stated plainly.
Thatcham S5 Plus, S5 and S7 at a glance
| Tracker | Best for | Standout function | Key limitation |
|---|---|---|---|
| Thatcham S5 Plus | Keyless relay and key-cloning risk | Immobilisation when the authorised fob is absent, plus fob-based ADR | Monitoring is required and priced separately |
| Thatcham S5 | Automatic Driver Recognition (ADR) | Fob-based ADR and alerts at ignition when the fob is not detected | No immobilisation |
| Thatcham S7 | Monitored recovery support | Professional monitoring and real-time vehicle location | No ADR, fob or immobilisation |
The three products are cumulative. S5 carries the verified S7 functions and adds fob-based ADR. S5 Plus carries the verified S5 functions and adds immobilisation.
Thatcham S5 Plus: immobilisation when the authorised fob is absent
Thatcham S5 Plus is the answer when the threat is a vehicle that starts for the wrong person. It combines monitored tracking, fob-based Automatic Driver Recognition (ADR) and immobilisation when the authorised fob is absent.
The point that matters for relay and cloning theft is the separation. The S5 Plus fob is tied to the tracker, not to the vehicle’s factory key. A relayed or cloned factory key does not present that authorised fob. The tracker’s own check then applies, exactly as the current product page describes it.
That is a design advantage, not a promise. Crystal Ball does not claim S5 Plus prevents every theft, and you should not plan as though it does. For the detail on how fobs and immobilisation fit together, read the guide to Thatcham S5 Plus immobilisation and driver tags.
Thatcham S5 Plus pros:
- Immobilisation when the authorised fob is absent.
- Fob-based ADR and alerts, carried over from S5.
- Monitored vehicle security with the verified S7 functions underneath.
- Headline price includes the tracker, VAT and nationwide professional installation at no additional cost.
Thatcham S5 Plus cons:
- Required monitoring is selected and priced separately, so the headline price is not the full ownership cost.
- Drivers must carry and use the authorised fob, which adds a routine to manage on shared vehicles.
- It does not remove the need for sensible key storage and physical security.
Thatcham S5 Plus pricing: check the current headline price on the Crystal Ball product page, and add the monitoring term you select.
Who it suits: fleets and owners of high-risk vehicles where keyless relay or key-cloning theft is the main concern.
Thatcham S5: Automatic Driver Recognition (ADR) and alerts
Thatcham S5 gives you everything verified on S7 and adds fob-based ADR. When the fob is not detected at ignition, the system raises an unauthorised-driver or usage alert, as the live page describes it.
That is useful when you need to know who is using a vehicle and be told when an unrecognised person starts it. It is a detection and alert function. It does not stop the vehicle moving.
The distinction matters for this topic. If a thief starts the vehicle with a relayed or cloned key, S5 can flag that the authorised fob was absent. It does not immobilise. If an alert is not enough for your risk, S5 Plus is the product to look at.
S5 also suits buyers whose insurer names the S5 category. Insurer requirements vary, and Thatcham Security Certification does not guarantee insurer recognition, which Thatcham Research says is negotiated individually by the product manufacturer and their insurance partners, so confirm the exact wording with the insurer before you order. The guide to what to fit when an insurer asks for a Thatcham S5 tracker covers that check.
Thatcham S5 pros:
- Fob-based Automatic Driver Recognition (ADR).
- Alerts when the fob is not detected at ignition.
- All verified S7 monitoring and location functions.
- Headline price includes the tracker, VAT and nationwide professional installation at no additional cost.
Thatcham S5 cons:
- No immobilisation, so it reports rather than stops.
- Required monitoring is priced separately.
- Fob handling needs a clear process across drivers.
Who it suits: monitored theft protection where you want Automatic Driver Recognition (ADR) and alerts, without immobilisation.
Thatcham S7: monitored recovery support
Thatcham S7 is the simplest of the three. It provides monitored vehicle security, real-time location, journey history and the tow and tamper alerts shown on the current page. It has no ADR, no driver fob and no immobilisation.
S7 helps after something has gone wrong. It supports stolen-vehicle location and recovery, with professional monitoring behind it. It does not add a check at the point of starting the vehicle, so it does little to challenge a thief using a relayed or cloned key.
That does not make it the wrong product. If your insurer or buyer asks for S7, or if recovery support is the goal, S7 is the right match and there is no reason to buy more than you need. For how alerts are handled, see what happens after a Thatcham tracker theft alert.
Thatcham S7 pros:
- Monitored location and recovery support.
- Tow and tamper alerts, journey history and app functions as shown on the live page.
- The simplest option for fleets that only need the S7 category.
- Headline price includes the tracker, VAT and nationwide professional installation at no additional cost.
Thatcham S7 cons:
- No ADR, driver fob or immobilisation.
- Limited protection against a vehicle that starts with a relayed or cloned key.
- Required monitoring is priced separately.
Who it suits: monitored security and recovery support where immobilisation is not needed.
How the three compare for this threat
S5 Plus is the only one of the three that immobilises when the authorised fob is absent, which is why it fits keyless relay and key-cloning risk. S5 adds recognition and alerts. S7 remains the sensible choice when recovery support is the whole brief.
This is about fit to this theft method, not overall product quality. Each product is the correct answer to a different question.
Understanding the real cost
A working monitored Thatcham tracker has three cost elements: the tracker, professional installation and required monitoring. For Crystal Ball S7, S5 and S5 Plus, the headline price includes the tracker, VAT and nationwide professional installation at no additional cost. There is no separate installation charge.
Monitoring is not included. It is selected and priced separately, so full ownership cost is the headline price plus the monitoring term you choose. Check both on the live pages before you decide. If you want to see how the options stack up, the comparison of Thatcham S5 Plus immobilising trackers sets out the evidence.
Practical steps that work alongside any tracker
A tracker is one layer. These habits reduce the chance of a relay attack succeeding in the first place.
- Keep spare and in-use fobs away from doors and windows, and out of sight of the street.
- Store the authorised S5 Plus fob separately from the vehicle’s factory key.
- Check the vehicle’s own settings and manufacturer guidance on key signal options.
- Park in lit, secure locations where you can.
- Set a clear fob-handover process for shared vehicles.
- Write down who is responsible for fobs at each depot.
These steps support, not replace, the tracker. They also cost almost nothing.
Which keyless car theft tracker should you choose?
Start with the threat. If a relayed or cloned key is the risk, choose Thatcham S5 Plus, because immobilisation when the authorised fob is absent is the function that matters. If you want recognition and alerts but not immobilisation, choose Thatcham S5. If recovery support or an insurer’s S7 requirement is the goal, choose Thatcham S7.
Whatever you choose, confirm the category your insurer requires, check the live product page for current functions and add the monitoring term to your cost. Crystal Ball is a family-run UK team, so a conversation before you buy is a normal part of the process.
FAQ
What is the best keyless car theft tracker?
For keyless relay and key-cloning risk, Thatcham S5 Plus is the strongest Crystal Ball option because it immobilises when the authorised fob is absent. S5 and S7 suit different needs.
Does a tracker stop keyless relay theft?
No tracker guarantees prevention. S5 Plus adds an immobilisation check tied to its own authorised fob, which a relayed factory key does not present. Good key storage still matters.
What is the difference between Thatcham S5 and S5 Plus?
S5 adds fob-based Automatic Driver Recognition (ADR) and alerts when the fob is not detected at ignition. S5 Plus adds immobilisation when the authorised fob is absent.
Does Thatcham S7 immobilise a vehicle?
No. S7 provides monitored location and recovery support. It has no ADR, driver fob or immobilisation, so it reports rather than stops.
Is installation included in the price?
For Crystal Ball S7, S5 and S5 Plus, the headline price includes the tracker, VAT and nationwide professional installation at no additional cost. Monitoring is separate.
Is monitoring included with a Thatcham tracker?
No. Required monitoring is selected and priced separately from the headline price. Add it to the headline price to get the full ownership cost.
Will a tracker lower my insurance premium?
That depends on your insurer. A tracker does not guarantee a lower premium or insurer acceptance, so confirm the exact category and terms with your insurer first.
One last thing
The mistake most buyers make is choosing a tracker by the theft that already happened, not the one they fear next. If your concern is a vehicle that starts for the wrong person, start with immobilisation. Recovery support matters, but a vehicle that never leaves is the better outcome.
If you are weighing S7, S5 and S5 Plus for a particular vehicle or fleet, contact Crystal Ball to confirm the category your insurer requires before you order.
Explore the relevant Crystal Ball tracker
Crystal Ball Thatcham S5 Plus Tracker
Monitored S5 Plus vehicle security with location, supported alerts and app access, fob-based Automatic Driver Recognition (ADR), and immobilisation when the authorised fob is absent.
£249
INCLUDES TRACKER, VAT AND NATIONWIDE PROFESSIONAL INSTALLATION AT NO ADDITIONAL COST. REQUIRED MONITORING IS PRICED SEPARATELY.
Related guides
- Tow and tamper alerts on Thatcham trackers explained
- Thatcham S5 installation certificates and insurers