EZOPower Wireless Charging Receiver for Samsung Galaxy S4 I9500 Ultrathin design, compact and lightweight without increasing additional weight of your Samsung Galaxy S4 I9500. Add wireless charging feature to Samsung Galaxy S4 I9500 by piggybacking it on the battery. Easy to use, works well with any Qi-enabled charger. Can be attached to the the battery all the time and will not interrupt the normal use of the phone. Output: 5V / 1000mA (MAX) How to Use: Open the phone back cover,stick the metal contact to the corresponding contact in the phone. After the Samsung Galaxy S4 I9500 receiver is installed,tear the sticker,stick to the phone positioning. Tips Of Use: Please refer to the Operation Manual and put the charging machine in charging area.All you have to do is put it in the charging area,it will start charging regardless of the place and direction.Try to put it near the charging center as close as possible. When the charge is almost finished but not yet it will stop charging,this is normal. When the product which is under charging condition is mixed with television and radio noise,please keep the product away from television and radio for more than 1M. It will affects wireless charging if the charging device is covered with thick protecting sleeves,you"d better take it off when charging. Compatible with: Samsung Galaxy S4 I9500