I recently used a pointer/controller with stopwatch that seemed to be this one: http://www.amazon.com/Logitech-2-4-Cordless-Presenter-Black/...

It was loaned, I had no idea it was so expensive. Good design, though. The stopwatch can be 'pumped up' in 5 minute increments to the time for one's talk. All there, nothing else to fiddle with.