Introduction: Wireless charge is the most popular technology in 2013.One advantage of wireless charging is with a pad on your desk, you can get quick opportunity charges here and there without having to remember to plug in all the time, just drop the phone on the pad when you sit down. Compatible to: Samsung Galaxy S3 I9300 / LTE I9305 / T-Mobile T999 / Sprint LTE L710 / Verizon I535 / AT&T LTE I747 How to use: 1. Pop the back off the phone. Place the receiver onto the phone battery. Make sure the contacts match precisely before tear the sticker off. 2. Peel the double sided tape strip, line up the contacts with the receiver contacts on the phone, and stick the device down to the phone"s battery. The receiver contacts have gold-plated "bumps" to ensure good connection to the phone. Double check to make sure they are lined up right. Then put the back cover back on the phone. 3. To charge- drop the phone on any Qi compatible charger pad and walk away. That"s it. Specification: Dimension：63 x 46 x 1.1mm Net weight：8 +/- 2.5g Input Power：>= 3.5W Output：DC5V/650mA (Max) Charging current：DC5V/500mA (Max) Charging time：5 +/- 0.5 hrs Reaction temperature：-10 ~ 40 Centigrade Working heat up range：<= 20 Centigrade (ambient temperature <= 25 Centigrade) Working ambient humidity：<= 80% Working life Charge & discharge ＞ 4000 times Package Content: 1 x SainSonic QI Standard Wireless Charger Receiver Tag for Samsung S3 Note: A Qi-compatible charger is needed to go with this product, which is not include in the package.