When asked about product features, avoid being over wordy or making your answer too long. Keep in mind that the interviewer either already knows about these features or really isn't interested in them. What they are interested in is whether you keep up to date on the technologies you deal with in this role. Look for visual clues your viewer may provide indicating that your answers are too long. These include fidgeting, looking at their notes, or other activities which indicate they are losing interest in what you are saying.