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"That's a first-rate training they give them in the Spies nowadays – better than in my day, even. What d'you think's the latest thing they’ve served them out with? Ear trumpets for listening through keyholes! My little girl brought one home the other night – tried it out on our sitting-room door, and reckoned she could hear twice as much as with her ear to the hole." (1.5.67, Parsons)
Its reach not limited to technology, the Party employs children against their parents as another way of to survey behavior.
He took his scribbling pad on his knee and pushed back his chair so as to get as far away from the telescreen as possible. To keep your face expressionless was not difficult, and even your breathing could be controlled, with an effort: but you could not control the beating of your heart, and the telescreen was quite delicate enough to pick it up. (1.7.22)
The Party’s chief monitoring device, the telescreen, is so sensitive that it can detect the rapid beatings of a person’s rebellious heart.
In general you could not assume that you were much safer in the country than in London. There were no telescreens, of course, but there was always the danger of concealed microphones by which your voice might be picked up and recognized; besides, it was not easy to make a journey by yourself without attracting attention. (2.2.2)
Its reach not limited to telescreens, the Party also places hidden microphones throughout London to monitor the interactions of its constituents.