The microphone MIC01 collects audio evidence as important as capturing video evidence, this preamp microphone is perfect addition to any video security camera system. This high gain mini microphone is the best for CCTV professionals, with Preamplifier IC built on board, it increases a microphone's low output voltage to a stronger, more usable level, it features low noise, high gain and auto level adjustment on-board preamp circuit. This mini microphone is only 5mm in diameter, easy to install.