The article is devoted to the study of the possibility of interception by a potential attacker of acoustic speech information using MIC-rophones, builtin or connected to a PC, operating systems running Windows 7, Windows 10 and Ubuntu 16.04, as well as the transfer of this information on the local area network. The peculiarities of the functioning of recording devices, and technologies about the creation of audible signals used in personal computer, and pathways in the operating environment, also describes the steps that can capture audio from a microphone and transmitting audio information over a local area network