SecuritySpy can monitor and record audio alongside the video from your cameras. SecuritySpy can access audio directly from a wide range of network cameras. In addition, you can connect one or more microphones to your Mac, and each one can be assigned to any number of cameras in SecuritySpy. You can also set SecuritySpy’s motion detection feature to be triggered by audio as well as video.
This page describes the different sound input devices you can use to connect microphones to your Mac.
Most Macs have a built-in audio input. In addition, some video input devices (such as the Grass Valley ADVC-55 FireWire input) also include audio inputs.
There are many inexpensive USB audio input devices available that provide two inputs (stereo), such as the Griffin iMic and Behringer UCA202. For higher numbers of audio inputs, M-Audio have a good range of devices.
Most of these devices are designed for music recording, however as long as a device has Mac OS X compatibility and can be seen as an audio input by the Mac, it will work with SecuritySpy.