The link you followed will bring you to this page:

https://www.amazon.it/Leicke-Alimentaotre-universale-Caricabatterie-Polarità/dp/B01GRS5V8E/ref=sr_1_1_sspa?__mk_it_IT=ÅMÅŽÕÑ&crid=32IJQG4E1XX0E&keywords=alimentatore%2B9v%2Bper%2BArduino%2Bmega&qid=1646571219&sprefix=alimentatore%2B9v%2Bper%2Barduino%2Bmega%2Caps%2C77&sr=8-1-spons&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExOTlZMjNCMVU4RlBVJmVuY3J5cHRlZElkPUExMDI0ODMwSU43Mk9IWjNCOTRGJmVuY3J5cHRlZEFkSWQ9QTA0ODUzMTAzMFRaOUJCVlpCSDZMJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ&th=1