NiiTTER 50mm Under-Desk Wireless Charger, Invisible Wireless Charger, Under-Counter Wireless Charging for iPhone 16/15/14/13/12/ Wireless Phones (Adapter Included)50 mm charging distance: the effective charging distance of this wireless charger under the table is 15 50 mm. It can charge through surfaces such as wood, granite, marble, glass, plastic and quartz. Our wireless charger cannot be charged by metal. If your phone case contains metal on the back, please remove the phone case for charging! Please do not put your phone directly on the charger for testing. There are 2 colored functional desk stickers