Direct CurrentPower; can be derived from an AC adapter or from a battery. Among DC voltagesof 6, 9, 12, 24, and 28, 12VDC is most common in the CCTV industry.
<12VDC>
Most board cameras,mini cameras and about one third of the professional cameras work with 12V DC,100mA to 200mA for B/W cameras and 150mA to 300mA for color ones. These camerasusually have DC jacks to accept DC power plugs. You should be careful about thepolarity (positive and negative) for this power source. 12V DC power can besupplied with AC Adapter or battery pack. You may even use a "powercord" plugged to the cigarette lighter in a car.