They are cheap China optics/accessories. They may work for a plinker, but I'd never use one for anything I had to rely on.
One specific plant in China makes parts and assemblies for Aimpoint, Eotec, Lucid, and quite a few budget red dots.
China will make products with the quality as good as you want it. Just don't expect the Chinese Aimpoint parts to be installed into a GI contract unit, that can't happen under the law. But a civilian model, who knows?
A red dot is just an emitter and a few flat coated lenses, with battery power and zeroing adjustments. A set of binoculars in the exact same price range is two sets of collated prisms and focusing lenses with an indexing mechanism to focus them simultaneously.
So, why the same price for less than 30% of the lenses, which aren't even ground to a power, with 25% of the casting to house them, and very little in the way of a circuit to power it? I've been asking this question on forums for over five years and nobody has an answer. Yet the chest beating about high priced red dots goes on.
If it's got glass lenses they will break. If it's got an aluminum billet or cast housing it will deform. If it uses batteries they will leak acid and destroy the circuits. If it's dropped on pavement, run over by a truck, or hit by a bullet, it will stop working. So will an expensive 3x9 scope. I like red dots, and I've had one since Aimpoint offered their first one, which I still have. But I cannot justify the extremely high prices - nearly the cost of the firearm in some cases. All for a couple of flat glass lenses and what amounts to an LED flashlight inside.
Buy quality, but don't let the China bashers get on your nerves about it. The don't have all the facts, the makers don't like to talk about it much.
naturally. 
