DSC-MP100 High Sensitive Preamp Mini Microphone with Power Bypass for Security Audio Sound Voice Monitoring Recording by DIYSecuritycameraworld Collect audio evidence as important as capturing video evidence A combined power and audio cable are included with the microphone Preamplifier used to increase a microphone's low output voltage to a stronger usable level Built in on board IC preamp, low noise, high gain and auto level adjustment Pick up every sound with this super high gain micro audio system.