The document discusses the development of a low-cost portable device called vBox that measures acceleration time and top speed of vehicles. It aims to provide a simple and clear user interface that allows switching between speed units. Lessons learned include starting early, testing APIs early, and that building a good GUI and accurately measuring speed using an accelerometer are challenging. Moving forward, the goal is to finish the vBox and potentially develop a social network app called Friend Organizer.

4. Demo A demo is worth 1000 words ... A demo is worth 1000 words ...