@sickburnbro @eee @VikingWays Also, unless the keyfob is using cryptography that protects against replay attacks to make the unlock code, a radio receiver can just read the unlocl code off the radio signal between the keyfob and the car.

Implememting such a thing is complicated and expensive, so it doesn't get done. A simple circuit like a garage door opener works well enough most of the time.

:02_shrug: