I could be there at the Kobra rendezvous in time to set up support systems, audio surveillance, radio monitoring, the whole bazaar.

It is also mentioned by V himself when he causes all visual and audio surveillance of England's citizenry to shut down.

If you would have let us plant some audio surveillance, I might have picked up some sweet talk.

"All right everybody, please start up audio surveillance now."

Is audio surveillance ready?

It wasn't appreciated, tampering with audio surveillance.

Freamon visits Daniels' office and tells him that they need audio surveillance (a wire) on the payphones surrounding the projects to make the case.

Through audio surveillance, they are able to prove that the recording was fake, which averts a war and vindicates President Palmer.

Their system is one based on visual and audio surveillance.

We increased the levels of audio surveillance to include the apartment where the suspect lives in Manhattan.