Summary: The keypad does not posses a NUM LOCK key. Laptops without numeric keypads often lack a NUM LOCK key on their own keyboards. I was stymied by this and found no reasonable solution online. Then, I depressed the main keyboards SHIFT key at the same time as striking the numeric keypad, presto - the effect of NUM LOCK.
Summary: Good keypad; works as I expect it to. The touch is good and responsive. The keys are noisy, but that's the only downside. I only use it when I'm away from the office, so that's not a big deal. I think it's a value.
Summary: It works good. Plugged right into my Mac no problems. I think the keys are a bit stiff or sticky, so I find myself making errors sometimes. I took 10-key and am a wiz at the adding machine. I also type very fast. So this is a little annoying to me. Nothing I can't get over though. I just have to make myself slow down.