ive tested a couple of things to see if they would block the signal by putting the keys in the container and then standing next to the car and trying to open the door
kids Lunch box would not block, small metal garbage can, would not block, cookie tin would not block. All would block if you lined the edge with aluminum foil before putting the top on.
foil lined Potato chip bag would block.
Wrapping in enough aluminum foil will block the signal
Those faraday bags are convenient, but I park in the garage so Im not that worried. Garage door openers now have lock switches which prevent the door from being opened using any opener.
kids Lunch box would not block, small metal garbage can, would not block, cookie tin would not block. All would block if you lined the edge with aluminum foil before putting the top on.
foil lined Potato chip bag would block.
Wrapping in enough aluminum foil will block the signal
Those faraday bags are convenient, but I park in the garage so Im not that worried. Garage door openers now have lock switches which prevent the door from being opened using any opener.