MG-108 – Add On Mini-Microphone for CCTV Cameras MG-108 Add On Mini-Microphone for All Cameras Audio output: max 2 V p-pPower supply (not included): 12VDC (+/-0.5V)Power consumption 10mASize: 1.6″ x .55″ x 3″Highly sensitive microphone and DC 12V power regulator built-in