The sticker isn't required to use the charger but a method to locate the charging position is advised
Kew Labs chargers do not require a sticker on the surface to be used but a method to identify the charging position is advised. Each package includes 7 sticker options (1 large round + 6 small round stickers) with a smooth matte finish that looks just as good on matte surfaces as shiny surfaces.
Doing your own charging indicator
Some other creative ways to mark your charging position that Kew Labs has come across include hand-carved four leaf clovers in an Irish pub, blue crabs carved into a beach side crab shack and many more. The possibilities are endless, so feel free to get creative and personalize your charging spot in a way that suits your style and preferences as long as the charging indicator is aligned to the center of the charger position. (see technical drawings here - www.kewlabstech.com/uts-2install)