Often fitted in operatives who are considered unreliable, untrustworthy or expendable, the Black Box is a recording device that records everything.
Every movement, every emotion, every word, every pang of lust or jealousy is recorded and subject to later study and evaluation. In the long run, such close scrutiny is very dehumanizing, and people who have studied your files know all your personal weaknesses, and can thus use social interaction directly against your Willpower rather than against your social skills.
When fitted to Homers, the Black Box will make periodic downloads of data summaries, but the amount of data stored in the Black Box is too large to allow full wireless downloads.