Complete Coverage

Durable hard-shell protection with a soft touch coating provides access to all iPhone 4 features.

Hot Swap on the Go

For every day usage, we recommend that you attach one battery to the Slim Case at a time. No need to stack multiple on your case- simply swap out for fully charged ones on the go. However, for convenient charging from a single power source, you may stack your Smart Batteries on your Slim Case and charge everything from the micro USB on your case.

Ultimate Flexibility

Daily phone power needs may vary - we feel that your solution should vary with it. A great protective case by itself and, if needed, transforms to a power case by sliding on any Third Rail™ Smart Battery (sold separately).

Share Your Power

The Third Rail™ Slim Case is compatible with all Third Rail™ Smart Batteries so you can easily share Smart Batteries among family, friends, and coworkers.

Power When You Want It

The integrated on/off switch on the Slim Case allows you to choose when you want power to flow from your Smart Battery to your iPhone. Simply flip the switch on the bottom left of your Slim Case to change it between stand-by mode (red) and charging mode (black).

Please Note: when charging your iPhone and Smart Battery together via a power source, the position of the switch does not affect the charging of your devices.

Apple Certified

Officially a "Made for iPhone 4" product.

Will this case work with all iPhone 4 models?

Yes, this case is designed to work with all models of the iPhone 4.

How is the Slim Case different than a traditional protective case?

The Slim Case doubles as a traditional protective case and as a power case only when you need it. The Slim Case is Smart Battery compatible, meaning when low on power you can attach a Smart Battery (sold separately). When you no longer need additional power, remove the Smart Battery and enjoy your sleek, protective case.

What are the three gold rails on my case?

We have created the unique Third Rail™ System to seamlessly transfer power without the need for cords. When you attach a Smart Battery to your Slim Case, power is seamlessly transferred via the gold rails.

Can I charge and sync my iPhone without removing my case?

Yes! You can charge/sync your iPhone using the included micro-USB cable.

Product Dimensions

4.96 in x 2.43 in x 0.46 in; 0.85 oz

Product Compatibility

Works with every iPhone 4, iPhone not included.

Box Contents

Slim Case for iPhone 4, Micro-USB Cable, User's Manual