... .USB output ,it can use for most smart phone,specially for iphone,for ipad3.with Led light inside,so it can light ... light,execellent back up battery for cell phone.Parameters of 2200mah external battery for iphone with led light,execellent back up battery ... led light,execellent back up battery for cell phone:It can use for iphone,for ipad,for samsang,for htc,most smart ...