2 Pack of 12V DC regulated CCTV power supply Four 2.1mm DC Output Center Positive Output 4 channel 2 Amp Total Simplifying the Installation Process Eliminates the bulky wall mounted power supplies, high quality, easy to use PW154 is a multi-channel output CCTV power supply, popular for home and small business camera installations. Simply plugs into one 120V AC outlet and it supplies regulated 12 volts D.C. to four cameras. Output has four standard 2.1mm barrel plug, center positive, it can plug into CCTV power & video cables or to plug directly into a CCTV camera's power harness. This allows multiple cameras to be centrally powered maintaining camera sync and simplifying the installation process.