These Qi receiver cards convert the Samsung S3 to enable wireless phone charging. You simply stick the card inside your phone cover. The Qi card will sit on top of the battery, under the coverand when used in combination with a standard Qi transmitter or power bank, will act as a Samsung Galaxy S3 wireless charger. The S3 Qi receiver cards comply with current WPC standards. Additionally, parts used in the device are made by companies which are current member of the WPC.