A "buzzer system" is a device that allows multiple people to buzz in and answer questions in a game or competition. It helps determine who responded first. Full definition
His family moved to Canada from Turkey when he was a child and, with the funds from the sale of a redesigned buzzer system for quiz show Reach for the Top, Lazaridis studied engineering at the University of Waterloo. (canadianbusiness.com)
«Eventually the parents and school chipped in and bought us a real buzzer system.» (gse.harvard.edu)
«It was hard to distinguish, so we used some grant money to purchase a wireless buzzer system. (educationworld.com)