When using it on the headboard of the bed, that is, vertically placing the clip and not horizontally, the arm cannot withstand the weight, resulting in bending. It is impossible to stabilize it above the head. It should be noted that we bought 2 products and both had the same problem.

I have bought 2-3 at different times, both for myself and for friends, incredibly convenient, the only thing you need is to already have a USB charger (almost everyone has an extra one) and make sure that where you will place it, there is a surface for the clamp to hold on to as it does not have a base.

Its neck is incredibly useful because you can easily adjust the light in any direction, so you can have it illuminating towards the wall as ambient room light and the next moment you can turn it towards your book if you want to read. Its light is quite powerful, personally I tested it with a 2A charger.

3 options for color temperature, 10 options for brightness, the light diffuses very nicely, a versatile product without unnecessary features (wifi, RGB) that increase the cost, and its construction looks very good, without any plastic parts.

Someone wrote that it has three levels of brightness. No. It has 10 levels of brightness. 10 in the cool and 10 in the warm light, which makes it perfect for reading (warm) and graphic work (cool).
Now, attention should be paid to the choice of the adapter because in the highest scale of the cool light, the current in amperes (A) is 1.50A while in the highest scale of the warm light it is 1A. So we do not trust the adapters from the Chinese ones that cost 1, 1.5, and 2 euros, no matter what they say about them, but we buy (again it will be Chinese!) from a trusted store. Personally, I found it perfect for my needs.
What bothers me is that the sellers do not mention technical details - maybe to not "drive away" potential buyers (in this case the non-existence of a suitable power supply), but in this way, they gather negative comments and underestimate the product.

Very good for its price! But after a year, the light colors stopped working (they were very useful!). It only emits white now. At least it is adjustable.

Strong clip, requires a USB adapter, has 3 shades and 3 brightness levels for each shade. Very satisfied with the purchase and at a good price.

Very beautiful design, "clean" inox, very strong clip and satisfactory cable length. Power supply requires a USB adapter. It has a strong illumination that offers 3 shades of white and brightness adjustment. Something that helps you adjust it to your taste and the lighting conditions prevailing in the space. On the positive side, the on-off switch has a light indicator, on the negative side, it is probably located quite low, which means that if you don't "gather" the cable and leave it free as it is, you will have to bend down quite a bit to reach it.