|Ultimate 3 in 1 mobile solution, featuring a super slim protective case always, a convenient and optional power case only when needed, and a universal external charger for 100s of other devices. Contrary to bulky traditional power cases, you can decide when/where/how to add on-the-go power. This may be the only mobile charger you ever need.
||The light-weight (1.4 ounce) Smart Battery is a universal backup charger for 100s of devices (necessary cables included). In addition to being a great portable universal charger, the Smart Battery can also slide onto any Third Rail Case (sold separately) to conveniently turn it into an on-the-go power case.
||Understanding that daily power needs may vary, this slim everyday protective case is also enabled with the option, when needed, to slide on a Third Rail™ Smart Battery (sold separately) to extend your iPhone 4's usage time! The sleek, lightweight, low-profile case featuring grip-enhancing soft-touch feel is compatible with all iPhone 4/4S models.