2 ms·
I do exactly this. I lined a cookie tin with foil, and tested it by holding the closed box (with the keys inside) next to the car. It didn’t unlock. Then I open
by jl6 8y ago
I do exactly this. I lined a cookie tin with foil, and tested it by holding the closed box (with the keys inside) next to the car. It didn’t unlock. Then I opened the box, and it did unlock. The box has to be closed (lid fully on, no gaps) or the car will still unlock.
Of course this only foils overnight theft. I imagine it would be trivial for someone to follow me from a car park to a public location and sit next to me to get the key signal from my pocket.
- gnicholas 8y agoDoes an unlined cookie tin not work? Does having the lid mostly closed (but with some small gaps) at least cut the effective range?
- Scoundreller 8y agoI’m wondering if a tin facing away from the door may be sufficient since the signal will be reflecting in the wrong direction. Then just a metallized flap for extra protection. Leakage is fine. As long as it’s in the right direction.
- jl6 8y agoI didn’t test rigorously but an unlined tin did not block the signal when the tin was right next to the car. Maybe it still reduces the range.
- jjeaff 8y agoI would imagine the signal emmitted from the fob is time sensitive. The codes should be invalid within a few seconds. If not, shame on them for such a terrible step backwards in security.