Teacher LED has an extensive list of interactive resources for the SmartBoard. One of their latest gadgets is a Quiz Buzzer. It's a simple resource to help with class quiz games. It works just like a game show style buzzer.
There are two button on screen representing two teams- red and blue. Two students can be at the board and hit the button when they know the answer to a question being read out by the teacher. The resource will show who hit the button first by lighting up and playing a buzzer sound. Once illuminated the display dims one light at a time which can be used as an indicator for when the answer has to be spoken by.