这个抢答器具有锁存显示功能，有主持人控制电路开始，有定时抢答的功能，定时时间为30秒，如在时间内无人抢答系统报警并禁止抢答，定时显示器上显示00.-The Responder has latched display, the hosts start control circuit, a regular answer in the function, regular time is 30 seconds, if no one in the time and prohibits the answer in answer system alarm, time display on the display 00.