A relay-style five electronic Responder Responder group circuit. The circuit has a self-locking, sound and light display, monitor time and other functions. Large ones may be in
creased. Drawing, buttons SBe is monitoring time button by the moderator master. Press this button, audio circuit voice, told Time has come to stop writing ; button SB7 role is when the question answered, or because of the time to stop to answer, the host press the button briefly, the circuit recovery.