Originally Posted by
Lomapaseo
That's where the recording equipment is for the video monitoring of the room
It could be where they are hiding all of the electronics for the WiFi in the room. I'm guessing that theres a bunch of electronics behind there that they don't want customers to get their hands on. I've stayed at hotels where where the WiFi didn't work and the front desk would send someone up and they would pop a panel such as the one in the picture and reset the modem.