9V battery holder with switch 5.5mm/2.1mm plug

This awesome 9V battery pack comes with an on/off switch and a pre - attached 5.5mm/2.1mm center - positive barrel plug. It's a perfect power solution for your Arduino or other electronic projects. Just take it out of the box and start using it! Note that the battery and screws are not included.

Using this 9V battery holder is a breeze. First, make sure your Arduino or other electronic device is turned off. Then, connect the 5.5mm/2.1mm center - positive barrel plug from the battery holder to the power input of your device. You can easily turn the power on or off using the switch on the battery holder. Remember, the battery and screws are not included, so you'll need to get them separately. When it comes to maintenance, keep the battery holder clean and dry. If you're not using it for a long time, store it in a cool and dry place. Also, always use the correct type of 9V battery to avoid any issues.