warning - you get no charging block. samsung says this here. the box says max 15w and also works with usb pd block "over 25w". no specs on website. quick start guide says nothing. found manual online: "the wireless charger is not compatible with chargers that do not support afc (adaptive fast charging) and sfc (super fast charging). to use the 15w fast wireless charging 2.0 feature, use the charger (9.0v/2.77a) supplied with the device, an sfc charger, or a pd (power delivery) charger (25w and higher). if a pd charger (less than 25w) or an afc charger is used, the 7.5w fast wireless charging 1.0 feature may work." double negatives and less than versus over aside, the answer is now a bit clearer. hopefully i saved you the long time i just spent figuring this out. hopefully.