Meetings often go off topic and you always have certain people who beat dead horses, over-analyze, filibuster, and otherwise spend too much time speaking. The introduction of a presentation timer keeps agenda items on time and the participants are treated more fair. There's no "let Steve continue because he's the boss." Everyone gets the allotted time for their agenda item. It has the additional benefit of training people to better prepare for their allotted time so that even in meetings without timers, they are better at managing their meeting time. Also - the meeting owner should be able to choose between an audible buzzer or silent. The buzzer should have a few options - from polite to down-right rude/obnoxious for the more whimsical folks.