The product you are looking at requires 24V power supply - are you sure, this is what you need? If so, please proceed, all good. If not, please visit the corresponding 12V item ;-)
Background info: We frequently have orders, where only upon installation customers notice, that they did not order what they needed. By then, usually the box has been opened, thrown away or damaged, cables have been cut and a few parts arre already permanently installed. Exchanges for such cases are not trivial and result in a substantial amount of work on our side and definitely costs on the customers' side. To prevent this, please double check what you need. Thank you!