When Winston and Julia go to O'Brien's apartment, what does Winston find particularly remarkable about the telescreen?

Whenandarrive at 's apartment to speak to him
about joining the secret Brotherhood, they are astonished and impressed by his luxurious home.
Unlike Winston in his dilapidated apartment complex, Victory Mansions, O'Brien enjoys the
privilege of having a butler and access to fine food and good tobacco in a comfortable
environment. Before O'Brien speaks to Winston and Julia about the Brotherhood, he turns off his
telescreen, which surprises Winston and Julia. Since O'Brien is an Inner Party member, he has
the ability to turn off his telescreen, which is something that Winston and Julia cannot do.
With the telescreen turned off, O'Brien proceeds to speak about the Brotherhood, and both
Winston and Julia express their desire to join the secret organization. After their brief
conversation, O'Brien informs them that he must turn on the telescreen to avoid suspicion.
Unfortunately, Winston and Julia are not aware that O'Brien is a loyal Party memberor that he
will eventually arrest and torture them.