Generic 1 to 4 DC Power 4-Port Splitter Adapter Adaptor Cable for CCTV DVR Security Cameras 1 DC Female to 4 Male Power Splitter Cable Plug Diameter: 2.1mm inner, 5.5mm outer Convenient and cost effective way to power up 4 cameras with 1 power adapter This DC Power Adapter Y Cable Pigtail splits 1 power signal into 4 and is useful for powering multiple cameras from one central adapter