Your presentation should cover the following items:
There will be a 10 minute oral exam of the group after the presentation. Each member of the group should be prepared to answer questions about the presentation. Answers of "that was not my area" are not acceptable. You should all be prepared to answer questions on what you did and why you did it that way. Help each other prep for this by teaching each other what you did.
Written summary of what does and does not work in your prototype
The slides from your presentation
3 page report on the details of your usability testing of the prototype. Clearly motivate the questions you wanted answers, why those questions were important, how you got user data to answer them, what were the conclusions, and how your conclusions are supported from the data.