TEMPERATURE CONTROL TECHNOLOGY?Exclusive Multifunctional Intelligent Protect Technology provides temperature control, surge protection, short-circuit prevention, and more. 0.47in thickness design plus intelligent temperature control system ensure cooler but more efficient charging. To get better experience, we would like you to take off the phone case and use our recommended adapters (NOT INCLUDED) and cables. ?IMPORTNAT NOTICE?? IF INDICATOR KEEPS BLINKING?Please check phone's back(or case) is not attached with any iron,metal,coins,IC Cards,bank cards,magnetic absorbers and other metal objects in the charging detective area. PLEASE NOTE THAT CHARGING WITH PHONE CASE (ESPECIALLY over 4mm ONE) MAY INFLUENCE THE CHARGING SPEED OR EVEN RESULT IN CHARGING INTERMITTENTLY OR DISCONTINUED. Basically, Yootech wireless charger works with Rubber/Plastic/TPU Cases etc.;MUST be within 4mm thin. ?SLEEP-FRIENDLY?Yootech smart indicator design is for your enjoying life more. Please site your phone at the center of the pad correctly. GREEN LED indicator will flash for 3 seconds if power source is connected, while LED light turns on for 16 seconds if recognizes your phone well. Entering charging model, light turns off and keeps the whole charging process SLEEP-FRIENDLY.