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Take a sheet of aluminum foil and wrap it around the key in several layers.
Make sure the foil tightly surrounds the key – the more layers, the better it blocks the signal.
Test whether the signal is effectively blocked – try to go to the car and check if it opens.
Method 2: Putting the key in a can or bag with foil
If you don’t want to wrap the key directly, you can put it in a metal can, e.g. after tea or coffee.
You can also buy a special bag that blocks radio waves (Faraday bag), which works on a similar principle.
Benefits of using aluminum foil on keys:
✅ Protection against theft – thieves will not intercept the signal and will not open the car.
✅ Cheap and simple way of protection – you do not have to invest in expensive signal blockers.
✅ Easily available materials – you will find aluminum foil in every kitchen.
✅ Effectiveness – tests have shown that aluminum foil effectively blocks radio waves.
Alternative ways to secure your key:
A special case that blocks waves (Faraday Cage) – available in car accessories stores.
Keeping the key away from doors and windows – reduces the risk of intercepting the signal.
Disabling the keyless function (if possible) – in some car models, this can be done in the settings.
FAQ:
1. Does aluminum foil completely block the signal?
Yes, if it is well wrapped in several layers. You can test whether your car responds to the key after wrapping it.
2. Can the foil damage the key?
No, aluminum foil does not affect the operation of the key or its battery.
3. Can I use a metal box instead of foil?
Yes, a metal box also creates a barrier to radio waves.
4. Does this method work on all cars?
Yes, provided that the car uses keyless entry technology.
Summary
If you have a car with a keyless system, it is worth taking care of its security. Wrapping your keys in aluminum foil is a simple, cheap, and effective way to prevent thieves from taking them. You may also want to consider additional security methods, such as signal-blocking bags or storing your key in a metal container. 🚗🔒
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