I like the idea, but it's too bulky and you can only put a few slips of paper in it, otherwise it won't close one, and it's great, but the limitation to that Locking of paper money is controlled by a clip on the side of the device. I keep it and put it in a case that I don't carry every day for rarely used cards and business cards. Plastic cards work well, but paper cards don't work and sometimes get stuck in the device.
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