Works very well. Unless I insert an optional locking section, the only way I can use the car's keyless fob feature is to bring the entire book/box within a meter of the car. Also, the signal weakens so much that the car doesn't see it (that's good). If I put an extra blocking element in there, even just a foot away from the car door, the signal will be so weak that the door won't open, which is VERY good. So I won't use the extra part that much, but if I get paranoid I will (maybe at night).
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