What is the Cable called that is for 30 to 38Vdc? I’m looking for two conductor, with the Screw Collar Connector, other end has an Orang/Red “O” Ring. I know 2.1 x 5.5mm is 12Vdc, 2.5 x 5.5mm is for 12VAC, and there is a 3.5 x 5.5mm that’s for security cameras, also fits Ring Doorbell Cameras.