Yeah already old stuff.
Yes it's an evaporative cooler. Yes it blows air cooler than ambiant - provided the ambiant RH is low enough. Evaporative coolers don't work well when the RH is medium to high.
And, this thing is so small that you feel cold air (again if air is dry enough) in front of it, but that's about it. Any room, even pretty small, isn't going to see its global temperature drop a single °C with this.
I've tested one of these actually a couple years ago, just to see. So yeah, if you're putting this close to you, you'll feel cold air if your ambiant RH is low (< 50%). Will you like that? Since it's again very small, not necessarily. It feels colder right where it blows, but it's too small to blow over your whole body (if you get away from it enough for that, you won't feel cold air anymore.)
As soon as RH gets above 50%, it's less and less effective.
These things are pretty simplistic too - just a tank, a small fan and some kind of paper filter which draws water and evaporates it. As you can guess, unless you wash this on a very regular basis, it will grow bacteria and become nasty.
There are larger and better protected evaporative coolers, but they are still not worth it IME. Not that the principle doesn't work, but in practice, you'd need a very large evaporating surface for this to effectively cool even a moderate room, and it would rise the ambiant RH so much that it would stop being effective after a while. The only installations that are moderately effective are those installed on windows and such (so they can draw outdoors air instead of recycling indoors air), but this is old tech. That was how AC was done a LONG time ago.
Don't waste your time on this. Oh, but if you still want to see for yourself, at least don't get ripped off. You can find the exact same cubic model for anything from $15-$20 to $100 or so. If you just want to try one, buy the cheaper ones. They are exactly the same.
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