Save4pay &reg; New Arrival Fashion Bear Stylish Diamond Crystal Calling Sense Flash Light Up Back Shell Case Cover for Apple Iphone 4 4S Color Changed Gift With Free CR2016 Battery Flash while calling or called,made of plastic, very lightweight; Package includes:1 x Sense LED Flash light Case for iPhone 4 4S; 1x CR2016 Button Battery; Colors:Black/White/Purple/Pink/Blue/Green(Default is Green,f you want others,pls feel free to contact us.Thanks!); How to use it: There has a lithium battery inside the case, please put it into the case battery position with the letter side updown, and gently push the battery to the right part, the case will shining very cool; Our products are all from factory direct supply, we can guarantee 100% inspection before shipping. If any problems of our products really exist, an exchange or a refund is available.