Third Rail Slim Case and Removable Rechargeable Smart Battery (1250mAh)
Compatible with: iPhone 4/4S
The Third Rail System for iPhone 4/4S provides the ultimate 3-in- 1 mobile solution, doubling as a razor slim protective case always, a convenient on-the-go power case when needed, and a universal external charger for other devices.
- Universal Smart Battery slides onto case when you need extra power, slides off when you don’t
- The Smart Battery can function as a standalone backup battery to power the phone or other devices via USB adapter (included)
- Easy-to-read indicator lights let you check the battery level of the Smart Battery with the touch of a button;
- Innovative Third Rail technology allows Smart Batteries to be stacked, automatically consolidating available power among partially charged Smart Batteries
- Contains a 1250 mAh Li-Poly Battery