The Responder is designed to allow four people to participate. In a later question, the red light-emitting diodes lit at the same time display shows second signal, A, B, C, D four pressing the button in order to determine the order after that time to the 60s followed by shows four of the ranking, if not more than 60s Rank excluding those who press the button. Press the button before the red light do not even count ranking.

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