This simple cable has so many uses! Plug a 9V battery into one end and connect the other end to anything with a 5.5x2.1mm centre-positive barrel jack. Use this cable to battery-power any device that needs 9V and has an onboard barrel jack - it works great for Arduinos, development boards, evaluation boards, and more! Package Contents * ​9V to Barrel Jack Adapter x1 https://elecena.pl/product/22714309/9v-to-barrel-jack-adapter-discontinued 2023-03-06 https://elecena.pl/product/22714309/9v-to-barrel-jack-adapter-discontinued 2024-09-19