Charger Station, KUPIIN QI Double Coil Portable Wireless Charging Pad Station for Samsung Galaxy Smartphones and All QI-Enabled Devices (White) It's normal for the pad and phone getting warm slightly during inductive charging. Do not use the cell phone during charging for safe. It's normal for the pad and phone getting warm slightly during inductive charging. Do not use the cell phone during charging for safe. NOTE: We strongly recommend using a 2A adapter/power source for the best result. (to be purchased separately). Wireless Charging: Starts the moment you place down any QI-enabled device or device equipped with a QI-compatible cover. No cables or USB interface required. Please read the User Manual carefully before use. Some of the smartphones need an extra receiver module to use.