Ultra-Slim Qi Wireless Charger Charging Receiver Module Sticker for Samsung Galaxy (Samsung Galaxy S4) Ultrathin design, compact and light weight without increasing additional weight The receiver can be attached to the the battery all the time, and it would not interrupt the normal use This receiver module is incredibly thin enough and make sure that it can give the newly-launched wireless charging capability Equipped with Qi Wireless Charging Technology, it can be wireless charged by any Qi-enabled charger Easy to use: Take off the back cover, attach the Energy Card on the battery, put on the back cover