现在市场上的一些抢答器成本高、体积大、线路多，而且操作和安装都很复杂。比如普通的抢答器，它是由通用集成电路制成，价格高、显示方式简单、性价比较差，人为因素也较大，在知识竞赛活动中无法精确保证公平公正。随着对控制方式的随意性加大，对电路连接的简化，使其在使用的时候更为方便和灵活必将去掉繁琐的连接线，取而代之的则是通过无线发射与接收的应用。-Responder on the market is now the high cost, bulky, multi-line, and the operation and installation is very complex. Such as ordinary Responder, which is made ​ ​ by Universal Integrated Circuit, the price is high, the display is simple, cost less, human factors, in the knowledge contest can not be accurately to ensure a fair and impartial. With the arbitrary increase of the control mode, connect the circuit to simplify, so that when in the use of more convenient and flexible is bound to get rid of cumbersome wires, replaced by a wireless transmitter and receiver applications.