direct tv changed to another room

I presently have a direct TV small device box connected to my bedroom Tv but do no use that tv at all and would like to move the small device box to my living room Tv to have cable in that room. 

The main box is in my TV room. 

How can I move TV access box from my bedroom to get service in my living room.  Can I unplug the box and just set up on the Tv in my living room. 

Thanks