Saluto lanka offers the best selection of individual CCTV camera power supplies and Multi channel power supplies (Central Power Supply).Most of power supplies output is 12V DC. But the current is varying. It is depend on the standard and the quality of Power supplies. However a single camera power supply output current must be not lower than 2ADC. Central power supplies output current also depend on the number of cameras you installed. Then you have to calculate the total camera current to match the output current of central power unit. Original power supply is always given you areal video in day time and clear video in night. Some cameras are working with 48V, 24V and 5V. You have to check the input voltage and the minimum current if you are buying these special Cameras.