If you're looking for an in-car USB charger, I bought one of these for my wife, also charges at 2A, and fits flush with most lighter sockets.
Amazon.com: Satechi CA-2421STB Car Lighter USB Charger Adapter with Smart Converter for iPad 2 Accessories
The link shows that it comes with a little widget (which it does) for charging iPhones, but I've not needed it to charge mine (iPhone 5), so I'm not sure what purpose it serves.
Amazon.com: Satechi CA-2421STB Car Lighter USB Charger Adapter with Smart Converter for iPad 2 Accessories
The link shows that it comes with a little widget (which it does) for charging iPhones, but I've not needed it to charge mine (iPhone 5), so I'm not sure what purpose it serves.