You need one interface for each 250 keypads. You should also check out Our Favorites page to find the right vendor for you.
Some companies charge for show day only.
And still others charge overtime on any day more than 10 hours. Either way, it should all shake out about the same. If you're comparing rental versus purchase, the rule of thumb is that 8 or 9 rentals is your break-even. First off, we believe that every company should own two or more Group Response systems. They should be part of every presentation, and every training session.