QQ-Tech LED Flashing Case Cover Sense Flash Light Hard Skin for Apple iPhone 4 4S 4G - Dragon Slim & Light Weight, Protects iPhone on sides and back from scratches & dents & abrasion; The case can light, shine, flash when calling and answering; All interface, ports and buttons are easily accessible while resting in iphone4 4G&4s shell casing; One 3V lithium battery ( CR2016 ) is included (Please note: the negative side is up when push it into the back cover), Conveniently to access and remove, can be replaced when used up; Perfectly slim fit with iPhone4&4S (Not compatible with 1 st gen. iPhone) Seller's Kind Reminder: this flashing light with patten is a lot fun to show and surprise your friends, but to be honest, the case itself is made of plastic, please do not expect it will be durable or last forever unless you use with attention. "