It has a seamless signal at a distance of 15 meters between transmitter and receiver with walls intervening, and it is confirmed to be truly waterproof. It is an economical and simple solution.

I put it six months ago in the village with the distance to the receiver being about 30 meters. It works great, has no problem with rainwater, and its sound is loud enough to be heard over music, radio, or television. Even from the vacuum cleaner (if you are in the same room). Very good purchase.

In a large chain, it said 220v, I didn't pay attention to the specifications, it is battery-operated which I don't like at all

Very good, helpful, without any problems, with powerful sound and good wireless communication between transmitter and receiver. Highly recommended.

Of course, it does NOT have a camera. It doesn't have any settings either. You just put in batteries and that's it. I liked that it had a window to write the tenant's name.
So far, it works fine and it hasn't gotten wet from the rain. The receiver works with batteries. I didn't realize that when I bought it. I would prefer if it could be plugged in. I will come back in a few months.

14/6/23 2 and a half years later, the doorbell works perfectly!!! We will buy another one.