This is a 9V battery pack with on/off switch and a pre-attached 5.5mm/2.1mm center-positive barrel plug. Use this to battery-power your Arduino (or other electronic projects) – it’s ready to go out of the box. Dimensions: 68mm x 33mm x 21mm ( 2.6in x 1.3in x 0.84in ) Lead length: 12cm / 5in Weight: 22.1g
