477
All the other brands went along
(slrpnk.net)
This is a most excellent place for technology news and articles.
The cheaper aliexpress item you actually want is this one, it will read the emarker and tell you the power/data rates it supports, if it supports thunderbolt etc https://www.aliexpress.com/item/1005007287415216.html
Some photos of it in action https://bitbang.social/@kalleboo/109391700632886806