This is a 9V battery pack with an on/off switch and a pre-attached 5.5mm/2.1mm centre-positive barrel plug. Use this to battery-power your Arduino (or other electronic projects) - it's ready to go out of the box! Battery & screw not included. Technical details * 68mm x 33mm x 21mm * Lead length: 12cm * Weight: 22.1g https://elecena.pl/product/22713536/9v-battery-holder-with-switch-5-5mm-2-1mm-plug 2023-03-06 https://elecena.pl/product/22713536/9v-battery-holder-with-switch-5-5mm-2-1mm-plug 2023-12-27 https://elecena.pl/product/22713536/9v-battery-holder-with-switch-5-5mm-2-1mm-plug 2024-09-19 https://elecena.pl/product/22713536/9v-battery-holder-with-switch-5-5mm-2-1mm-plug 2024-11-29 https://elecena.pl/product/22713536/9v-battery-holder-with-switch-5-5mm-2-1mm-plug 2024-11-30 https://elecena.pl/product/22713536/9v-battery-holder-with-switch-5-5mm-2-1mm-plug 2025-11-28 https://elecena.pl/product/22713536/9v-battery-holder-with-switch-5-5mm-2-1mm-plug 2025-11-29