Hi Tynusiiaa!
The boots have a 24 hour cooldown, so once you used noone will be able to used again before the 24h of CD, this cannot be verified by looking at them. Only way to verify it is putting them in depot and looking on them at the market, seeing as only a pair with charges can be sold via the market.
Keep in mind that these boots can only be use at Protection Zone, it doesn't gonna work if you are skull, or out of PZ.
And also is important to know that to it works its necessary have done the Voodoo Master Quest.
Once you had done the Voodoo Master Quest and use the boots in PZ, you will get teleported to the Ferumbras Citadel and the text will appear the following message:
"Magical sparks whirl around the boots and suddenly you are somewhere else."
The cooldown affects the item and your character, but just in case I will check it again when I be at home for be 100%! I believe this works like when you click a Seashell.
I will edit this at home with some pics.