I love it. It is waterproof and holds around 4 keys or 1 car key and 3 standard house keys. I wouldn't trust a magnet to hide this under your car frame for long. Your best bet is to buy 3M VHB and permanently tape the whole body instead of attaching it with magnets. I have a feeling the car's vibrations will eventually cause the magnets to move. Just my opinion, but better safe than sorry. But I like that it closes and closes with latches. Just insert your car and house keys as shown in the photo.
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