Ultra-thin design very light and convenient to carry.Easy installation and removalA fully protective ultra-resistant case and Battery in one.Integrated Power Switch allows you to switch the battery case on and off, use the battery only when you need it.Rechargeable lithium polymer battery.State of the art battery technology extends the life of your phone for hours.Check the power status at a glance with the integrated 4 light led indicator. Know before you go.It allows you to charge and sync your phone while refilling your battery at the same time.Built in short circuit and over charge protection.Safety first.