... 99 pcs 3.high clear voice 2.4GHz wireless audio intercom,supporting 99 pcs intercomElectrical Features1. Using 2.4G ... pressing success (if already pressed the number key for 2 times, the third pressing on the number ... in 4s, and the green light will flash, for one time after 4s clearing record.Coding to add ... green light will flash one time, sound ‘DI..’ for 3 times, then exit ID setting mode and return ...