9VDC 1000mA (1A), 2.1mm X 5.5mm, Regulated Power Supply, Extra Power 9VDC 1000mA (1A) Regulated Power Supply, Extra Power 9V DC (Regulated & Filterer) 5.5mm (Out Side), 2.1mm (inside Hole) Regulated and filterer output protects your electronic devices from over voltage damages, and increase life of electronic circuits and products you are using with Use it with For Security Cameras, etc. (Extra power for LED cameras)