How do voting keypad systems work?

At various times during a presentation of some sort, a multiple choice question is put to the audience via the projector screen. Each member of the audience has a wireless RF voting keypad with numerical buttons on it. The participants read the question, they read the answer choices and then they press the button that corresponds with the answer choice that they most agree with.

The votes are rapidly gathered (anything from 100 votes per second) by the base station that is connected to the computer and the data is converted into a graph of some sort. The audience can then see from the generated graph what percentage of the audience (or how many people) voted for each option.

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