i have one like this..
only mine has one ring on the top and another on the bottom. The bottom ring is detachable via a button that you push on the side of the rectangular middle section. It makes it easier in the winter because if you want to warm up your car, you put your car keys on the top ring and your house keys on the bottom ring and disconnect the bottom so you can leave your car keys in the ignition and take your house key to lock up. This design is also easier if you let someone borrow your car...just disconnect the bottom ring and give the middle section and top ring to whoever is using your car.
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