What is LUM in card reader?

I'm looking at buying a card reader that claims to have 4 sockets and 5 lums. It supports lum to lum read/write operations.

What does "lum" mean, anyway?

Here's a link to the reader in question:


After not getting any responses in this forum on this after a few days, I have edited this post, including a link to the card reader, and I also wrote to the manufacturer about this and am waiting to hear back from them.

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