I have several of these. They are tiny but can store a lot of music. However, they can easily get lost, so be sure to attach a string or charm to them. A lid won't help, but I put these lidded types in a used pill container with a label to identify them when not in use. By the way, this product would be much better if the strap loop on the device was bigger as it is very difficult to attach anything to it.
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