While I bought 3 pieces and thought it would be something simple. In the end, it wasn't.
First, it requires changing the socket box with specific specifications.
Second, it requires purchasing a POE SWITCH which is currently quite expensive.
Third, it requires purchasing the special tool to fix the RJ 45 connector so that the Ethernet power cable can be connected internally.
I put them in the warehouse. Wasted money once again.

I bought 3 for separate apartments in a building. They have been working perfectly for 2 years without any issues. The only downside is that in order to set them up the way I wanted, which is to receive power from the ethernet line, I had to pay an extra large amount for the power supply that connects to the router they receive the signal from. Other than that, it is sleek and you don't even notice it unless you look closely and realize it is on the wall.