If you exclude the fact that the first, as well as the second, came with a relatively damaged internal battery (that's why I asked for a replacement the first time because I hadn't opened it yet to see what could be wrong, so I thought it was all a problem), which didn't charge for days even if I left it plugged in, and so the machine didn't work at all, something I realized after I opened the second one when it arrived, as after a while on the charger it also didn't show anything on the screen (the internal battery was completely discharged and the power that charges it was no longer enough to do so, so if it doesn't work with the battery, it doesn't let the power pass unless it's activated, you know, I jump-started the internal battery with an external power supply with more volts later when I opened it to see what it has to work later), so I simply stuck a AA battery case underneath and put a rechargeable AA battery which I connected in parallel with its own (1.5v) because it seemed extremely dangerous to remove it/unstick it because it was very well stuck, so heating it with the soldering iron for as long as it took to remove it was not a good idea if I wanted to continue living and it didn't seem worth the trouble anyway.

I would like to point out that it is not a new product in general (I think it came out in 2014) so it is perfectly logical that from the moment its battery remains uncharged (and we are talking about a battery with very low capacity) and the product is stored in closed warehouses for years, it is logical for something like this to happen, obviously, however, the battery should be removable, so this is a small "problem" in the design from the beginning, otherwise, and I emphasize this, I have not encountered any other problems and it works perfectly and with the patent I made, it now lasts for months without being plugged in when I don't want to use it, but now it can't have the same problem since I change the battery whenever I want.

It is a bit complicated in programming. But two months that I have it, it does its job just fine.
Update 11/6/2018:
Suddenly the relay started sticking, opening and closing whenever it wants. Resetting and reprogramming didn't change anything, so I have to remove the initial stars I gave. I'm sorry, I expected more from a branded product.