说明：  能准确判断出抢答者的电器。在知识竞赛、文体娱乐活动（抢答赛活动）中，能准确、公正、直观地判断出抢答者的座位号。更好的促进各个团体的竞争意识，让选手门体验到战场般的压力感。
(Can accurately determine the electrical appliances of the responder. In knowledge contest, recreational and sports activities (contest activities), the seat number of the responder can be accurately, fairly and intuitively determined. Better promote the competition awareness of all groups, and let the competitors experience the battlefield like pressure.)