They know everything, Arakhor. They see you, and hear you, via a series of well-mounted cameras. They have a message for you.
"When having any private conversation, whether via phone or with those in your home, turn down the TV and radio to cut down on noise pollution. Also, please try to keep your conversations lively. Maybe some local gossip, or polarizing sports opinions. Too much boring talk about plans for your garden, or where to buy good laser discs, can make the Secret Police tired, and less effective at their jobs."