Poor quality rubber that results in it detaching from the glass no matter where I placed it. As a result, the entire base is eliminated, making it useless.

Friday, June 5, 2020
Today I received the mobile phone holder base in the morning, and I realized that for its price, I think it's worth it, considering how cheap the Clip Holder (Phone Holder) for mobile phones is. Because you can only apply it to mobile phones (Smartphones), not tablets. And I think it's suitable for mobile phones up to 6.5 inches, not larger.

1) Now, regarding the phone holder base, if you want to suction cup it to the windshield in front of your car, you should know that the phone can only be mounted horizontally on the base. ("Not vertically").
2) However, if you want to have your phone (Smartphone) in a vertical position, then the only option is to suction cup the phone holder base to your left window (the driver's side window). Either in the upper right corner or the lower right corner. And of course, this position on the driver's side window is also convenient for the holder base.
But when we say the driver's side window, we mean that you will rotate the phone holder base clockwise or counterclockwise to such an angle that suits you, as the neck of the holder base is curved, and of course, so that the phone (the screen) faces you.
Perhaps this location may not be convenient for some, but it is the only disadvantage that I mentioned in No. 1 above when you want your phone (Smartphone) to be placed vertically.

Finally, in the holder base, the two orange plastic brackets where you will place your phone (Smartphone) are not securely attached.
So what will you do? You will take a moment glue and spread a very small drop on the edge of the orange plastic on the entire surface (from the back, that is) from right to left, and you will hold it with your finger for 1 minute while blowing to dry, and the orange plastic brackets for your phone (Smartphone) will be ready.

Also, if you want to make a small modification to make the neck of the base sturdier and not easily rotate in potholes or car vibrations, you can do what I did.
I cut a small piece of cloth that we use to clean windows, for example, house or car windows, a small piece the size of our fingernail, I spread it on the ball (I put a hat on it, so to speak), and as it was, I attached it to the base. I tightened the ring a little, just a little, not too much to break, and that's it.
Now it doesn't move at all. Not in vibrations, not in potholes. Okay, we didn't mean to drive in the Rally Dakar on sand dunes upside down, etc.
And that's how I found my peace. Neither the phone falls, for example, in a vertical position, nor anything. It's a sturdy base, and the orange plastic brackets are sturdy at a satisfactory level. Okay, it's not a high-quality mobile phone holder base, but it does the job.

We bought two because it seemed smart and easy to install, but both bases broke in less than 2 months!!! You get what you pay for in the end!!

Permanently stuck for 2 years now, perfect for its price!
The only disadvantage is that it is difficult to detach the mobile, it requires 2 hands.