Washington - Arabstoday
Get two for one with the Third Rail System, a protective phone case that delivers extra power when you need it. Designed for the iPhone 4, it consists of a protective slim case and a universal removable battery. When you need power, simply slide the battery onto the slim case. It also can work as a standalone universal charger for other devices via a micro USB. Don\'t need a battery today? Remove the battery from the case.