I'd interpreted that as no visible speakers. It's not uncommon for speakers to be encased in devices with no obvious outlet. But you highlight a good point, although it's misleading, it's not entirely incorrect. It's a summation from a characters point of view, telling you what they see. Or so that's how I took it, as opposed to a narrator telling you the observations in full. But it is misleading for sure.

I also thought that specific description related only to the door and not the device.