The Brydge 12.3 keyboard is a 0.7-inch aluminum backlit keyboard cover that is designed to make the Surface Pro feel more like a laptop. The key feature of the keyboard is that it allows the attached tablet to be opened to any angle without using the kickstand for support.
http://www.notebookcheck.net/Brydge-Keyboard-turns-your-Surface-Pro-into-a-laptop.189882.0.html