This is used, works fine, but DOES NOT include a power supply box. It has the power supply cord, but needs this little box to send power over the ethernet cable. The model of the box needed is: TP-Link TL-POE10R

Here's a listing for a cheapest one on eBay (at least when I was searching for it on Mar-25-23 - make sure to search yourself to find the cheapest): 

https://www.ebay.com/itm/275738655938

Thanks.