Did you see the latest...where you can wave from across the room to disengage your tv etc...but at the same rate they can tell by your movements where you are in your home or business?
You don't have to be 'in the room' near the device to remotely control your TV. It can 'see' through walls, which your last sentence indicated.
Furthermore, you can actually be 'seen' through walls. Even if you stand still. The equipment for this hasn't been reduced to a single chip... yet. But it is in use by our government.