DESC: WhiteLight is a revolutionary new system that incorporates light technology to whiten your teeth fast. Light treatment is the latest whitening technique used by dentists. The unique, patent pending WhiteLight system is designed to be used at home and is extremely easy to use. And if you're one of millions with sensitive teeth, WhiteLight is perfect for you because it works so fast, your teeth don't have time to become sensitive.White Light includes:Light TransmitterGel ApplicatorDental Tray"Secret to a Beautiful Smile" booklet2 lithium batteries