Introduction - If you have any usage issues, please Google them yourself
Four Responder, Responder has four groups, the system begins to enter the answer in the state, began to answer in 20 seconds after the countdown, no answer after 20 seconds countdown display timeout alarm signal when the button is pressed all the way to answer that way Responder signal Answer the remaining brightest signal blocking, while ringing, showing that the way Responder station ID an end to press the reset button resets all states.