Very good purchase for 20€. I bought 2 and installed them on the driver's and passenger's headrests. I also had screens on the headrests of my old car, but these have more vibrant colors and better contrast. Along with the dashboard mount, it also includes the mounts for the headrests. The kids are thrilled.

ATTENTION
I should add that in order to install the screen on the headrest with the provided mount, you need to cut the back of the headrest and remove a significant amount of material from the foam to be able to fit it on and secure it with zip ties on the metal frame inside. There are relevant videos on YouTube.
https://www.youtube.com/watch?v=FwEEHQwSnjA

I bought it for use with a rearview camera, but the response on one input simply doesn't exist (you have to manually close the monitor because it doesn't have a safe mode, and as soon as you switch to reverse, it stays on a blue screen with the message "no signal"). On the other input, as soon as you connect it to reverse, it switches to the "back view" channel, but it doesn't show anything. I installed it with a "hack" so that it can receive power just like the camera (i.e., through the reverse signal), but it takes about 5 seconds to turn on. It bothered me at first, but now I'm used to it.