I bought that as an ebook on Amazon but it got remotely deleted for 'copyright' reasons from my kindle so I never got to read it. Is there something about listening devices in it?
Telescreens more or less fit the bill. From Wikipedia:
> Telescreens are fictional devices which operate as both televisions and security cameras. [...] All members of the Inner Party (upper-class) and Outer Party (middle-class) have telescreens in their homes [...] Telescreen cameras do not have night vision technology [but] their microphones are incredibly sensitive, and they are said to pick up a heartbeat.