First of all, it is not a "smartwatch" in the sense that smartwatch users know!
The process of pairing with a smartphone through the Casio app is unnecessarily complicated.
I am not new to smartwatches, and on my phone, moto g52, I have connected: Samsung Galaxy Watch, Haylou Solar LS05, Amazfit Neo, Xiaomi Mi Band 4, Amazfit GTR 3 Pro, without any problems, except for the Casio, which took me considerably more time following the instructions to connect and when it disconnects, which happens frequently, it does not automatically reconnect like the others.
As for notifications, the process you need to do on the watch to see one, if you receive any, is not worth it. Also, if there is not enough lighting, the screen is not visible, even though Casio calls it MIP (Memory In Pixel) LCD, the letters are tiny and the "illumination" lasts only 3 seconds, and the notifications are only 2 lines of text!
As for measurements, you have to specify what you are going to do, for how long, and for what distance! In contrast to other smartwatches/bands, where everything is done automatically!
As for the app now... Simply terrible. And the tragic thing is that after every update, it gets worse, as besides the difficulty of connecting/reconnecting the watch, it gives restart notifications at least 10 times a day!
For those interested, I would recommend watching on YouTube the synchronization processes, notification reading, but above all, the battery replacement process before getting it, something that unfortunately I did not do.
Personally, I have it connected to my phone for time synchronization, but I have disabled the notifications due to the process required to read them.
In my opinion, it is not worth its money, as there are much better smartwatches and even simple Casio watches than this one.
If it was at least solar-powered, so that the battery wouldn't need to be changed every year and not with a negative display, then maybe, but as it is, simply no.