"Keyless Go theft protection" and "keyless go blocker" are the kind of searches that show how uneasy people have become since relay attacks started making headlines. Two different things often get mixed up here: protection against radio theft, and protection of the key cover from scratches and drops. Both are worth having, but they're two different products with two different jobs.
How a relay attack on keyless systems works
In a relay attack, one person uses a signal amplifier near the house where your key is kept to boost the key's radio signal. A second person stands by the car and picks up the amplified signal, so the vehicle believes the key is right next to it – the door unlocks and the engine starts, even though the key never left the house. German motoring organisation ADAC has confirmed this weakness in repeated tests; a 2025 test found that only around ten percent of more than 700 vehicles tested were immune to this method.
What actually protects against relay attacks
The protection ADAC recommends is a Faraday pouch or box: a container lined with shielding foil that fully blocks the key's radio signal while the key is inside it. Keeping the key as far as possible from exterior walls and entrances also helps, since it reduces the range an attacker can work with. The most effective, if least convenient, option is disabling the keyless system on the car itself, where the vehicle offers that setting.
What a silicone or leather key cover doesn't do
kwmobile's key covers for models such as VW Golf, BMW, Ford, Audi or Renault are made from materials like silicone, genuine leather or faux leather, and protect the key from scratches, drops and everyday wear. These covers aren't designed as radio shielding, and kwmobile doesn't advertise them as having that property. If you specifically want protection against relay attacks, you need a separate Faraday pouch or box; a regular protective cover doesn't substitute for one.
Motion sensors in the key as an extra hurdle
Some manufacturers now build a motion sensor into the key that automatically switches off its radio signal once the key has been still for a while – Mercedes-Benz, for instance, after around two minutes of inactivity. That makes relay attacks harder, but it doesn't replace a Faraday pouch: while the key is moving, or has just been put down, it's still transmitting, and that window is enough for an attack. Whether your vehicle has this kind of sensor is stated in the owner's manual or can be confirmed with the dealer.
Why both products still make sense together
Everyday wear on a car key – drops on pavement, scratches from being tossed in a bag, discolouration from sun exposure – has nothing to do with radio technology; it's simply material wear. A well-fitted protective cover prevents exactly that, regardless of whether a Faraday pouch is also used for theft protection. The two measures address different problems and don't rule each other out.
Matching key covers by vehicle model
- VW Golf 8, 3-button key
- VW Golf 7 / Mk7, 3-button key
- BMW 3-button Smart Key
- Ford 3-button Keyless Go
- Audi A6 / A7 / A8 / Q7 / Q8, 3-button
What to look for in a key cover
The most important thing is an exact fit for your key model, since button layouts differ between model years and trim levels. Silicone covers grip well and absorb drops effectively; genuine leather looks more premium but tends to show wear faster under heavy use. A transparent cover shows off the key's original design but offers slightly less impact absorption than a solid silicone or leather cover.
FAQ
Does a silicone key cover protect against keyless theft?
No. It protects the key physically from scratches and drops, but it doesn't block any radio signal. For theft protection you need a separate Faraday pouch or box.
How big is the risk of a relay attack, really?
According to 2025 ADAC tests, around 90 percent of the more than 700 vehicles tested could be opened with this method. The risk applies to the majority of current keyless vehicles, not just isolated cases.
Is it enough to just keep the key further from the front door?
That reduces the risk but doesn't rule it out, since modern signal amplifiers can bridge greater distances. A Faraday pouch offers more reliable protection.
Can I use a protective cover and a Faraday pouch at the same time?
Yes, one doesn't rule out the other. The key cover stays on the key for everyday use; the Faraday pouch is used additionally whenever the key is left at home.
Does my key automatically have a motion sensor against relay attacks?
Not necessarily. It depends on the manufacturer and model year; the vehicle's manual or the dealer can confirm this reliably.
