At Citibank, a futuristic, $4 million surveillance system keeps a clear and constant eye on automated teller machine locations.

A far cry from the clunky closed-circuit television systems of the past, Citibank's system relies on a combination of real-time monitoring, digital video, and two-way audio to let the bank keep tabs on 132 branches and, when necessary, to intervene by voice via speakers in the ceilings.

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