The Sonoff Basic without its plastic case.

It can fit both pow and dual, apart from the basic, as long as someone puts it without the frame, only as a board. It is good for someone to research it before writing something inaccurate. I have been using it for five years and I have installed pow, dual, basic, rf. It can also fit the th if you install the thermometer and not the thermometer-hygrometer, which is not waterproof.

First of all, keep in mind that it is ONLY intended for the Sonoff Basic. It does not fit any other product of the company, as they do not fit in the box. Even for the Basic, it takes a little effort to fit it, as it basically goes in and wedges with the cables. As for the build quality, it is good, it seals both from the cover and the clamps and no moisture has been detected inside. In case you need to re-pair the Sonoff, you have to open the cover to access the device's button. I recommend it only if you want to have visual confirmation regarding the Sonoff's LED, otherwise, prefer any plastic waterproof box, there is no difference.

Unfortunately, it does not state in the specifications that it is only for the Sonoff basic!! Unfortunately, both the Sonoff POW and the TH16 that I bought together do not fit in the box, so it becomes useless for this use!! Other than that, it is a waterproof and sturdy box.

Excellent. I have 3 of these and 2 are in the sun and rain for 1.5 years without any problem. Not even a trace of water gets inside.
It requires some basic knowledge to be installed correctly. If you don't have the expertise, get an electrician so that you don't cry and ruin the circuit board you have put inside.

I tried it for the TH16, but it definitely doesn't fit in any case. The only one that fits is the Sonoff Basic. The construction is very good and durable