Don’t bother. Mine lasted 2 months and died.
listed for 19.99 on amazon with a single 2 star review
Go ahead and add S9 to the compatibility list.
I have one that looks identical including the shape and printing but the brand is different, so I assume “SwissTek” is just another Chinese knockoff distributor. The one I have has been going strong for a couple years on my office desk.
Mine lasted a whole 4 months with a Galaxy S9+. Waste of money but probably most of these Qi (Chinese word) chargers are made by the same factory in China. Any good U.S.-made fast-charge wireless chargers around?