I have struggled and tried many shower phones until I ended up with this one. Expensive, cheap, branded, Chinese, plastic, metal, from supermarkets, from the Internet, from bathroom stores, everything.

The main thing with shower phones is to throw water with pressure. Everything else comes second. If it doesn't have pressure, it doesn't matter what shape it throws water in, or if it's illuminated. If the water supply network or the water pressure booster in the apartment building does not have the best possible pressure, then most shower phone designs that have the classic shape for a shower fail. Generally, in order for a shower phone to have pressure, it should release less water at its outlet than it enters at the same time. This specific shower phone, therefore, because it has a simple design, with a small internal diameter and few holes at the outlet, creates intense pressure.

There are other shower phones that, because they have small dimensions and few holes, usually in a cylindrical or square shape, also produce good pressure. The disadvantage of those designs, however, is that because their shape is symmetrical, it is not always clear in which direction the outlet is facing, resulting in sometimes missing the target and wetting the area as soon as you open the tap. This specific design, because it really looks like a real telephone handset, is much more user-friendly.

The only drawback I find is that the outlet does not unscrew in any way so that I can clean the holes from salts and pebbles. But for the money, it is worth it and more.

Update 2023: The outlet does eventually open. I cleaned it from salts and it's like new. It has clips on the cover, so open it carefully to avoid breaking them.