9 V Battery Barrel Converter Cable - 9 V to DC Barrel Adapter
Although it looks like a simple cable, this product converts 9V batteries to DC Adapter socket.
It can be easily used in many systems, especially LED strip light and Arduino. It is positively centered and has a length of 3.93". It has a 2.1mm x 5.5mm male plug type.
Arduino and battery shown for example only.