Mophie Iphone 4 external battery case

Mophie Black juice pack IPhone 4 case. It's a iPhone case with a 2100mAh external battery built in. After your battery dies it automatically switches to the cases extra battery. Which holds the life span of 120% to get you threw that long weekend or event. You never have to worry about your phone dying again. Losing your work or not being able to capture all those amazing pictures and memories. SurrOunding the case is a duel textured, Rubberized, Shock resistant band. ?NWOT?Retails $120?HALF OFF