Compared to the TP-LINK TAPO C200 that I already have for over a year, I have the following to say about this specific camera:

1. It does not have a separate removable base for wall and ceiling. It only has 2 holes below the camera for screws or nails to be inserted into the wall, but you have to measure the distance between them on your own to fit perfectly and attach. The TP-LINK had a special adhesive for this.
2. It includes a power supply, but its cable is short, about 1 meter.
3. Every time it restarts (e.g. after a power outage), it makes an excessively loud music sound. This makes it UNSUITABLE as a baby monitor.
4. In two-way communication between the user and the camera with sound through the mobile application, the camera's speaker has a very high volume that unfortunately CANNOT be adjusted, to the point where it scares those who hear it. So it is more ideal for outdoor waterproof areas (e.g. on the front door) rather than inside the house, unless this specific function is not used.
5. Its speaker does not produce clear sound, there are "snow" noises, as if you are speaking through old cordless phones.
6. It includes installation instructions in Greek, but they are not easily understandable, especially for those who are not very familiar with technology. It is advisable to watch various videos on YouTube that are available for this specific model because you will struggle quite a bit.

The only additional feature it has compared to the TP-LINK is that it follows anyone it detects, but in a closed room, you can hear the sound of it moving left and right. However, be careful, it does not move automatically up and down, only manually. This means that it may not capture people sitting or standing (depending on how it is adjusted).
What the TP-LINK has that this camera does not have is the ability to sound an alarm itself, with sounds and flashes.

The image it projects is relatively satisfactory.

For the offer I got it for around €18, I consider that it is worth the money up to that point.

UPDATE: 12/7/2021
I noticed that when you speak from the application to the camera, the response from the person in front of the camera has a sound delay of about 2-3 seconds, during which whatever they say within this time period gets "cut off" and is never heard.

In sound, I have no problem, on the contrary, it is crystal clear. The problem is that I haven't found how to record events like Xiaomi does. When it detects motion, Xiaomi records from 6 to 15 seconds and you can view them at any time. Night mode and color resolution are inferior to Xiaomi. Another negative aspect is that after 5 hours of operation, it disconnected and I had to rush to see what was happening. Update on 14/12: second disconnection, minus one star. I will continue using it for a few more days and then send it for service or return it to the store. On 16/12, I took it back to the store for inspection. As of 23/12, I haven't received any news, so I will probably have it with the new year. Good morning and happy new year. On 26/12/2019, the store where I bought it replaced the camera after a week, but the problems continue. Today, I receive motion notifications but I can't see anything because it tells me that the camera is offline. It's a waste of money and a hassle. I will talk to the store about returning the camera and getting a refund. On 16-04-20, the camera had two upgrades and it improved. It hasn't disconnected and it works better