... “Du…” and stop, but called intercom is available to answer the call within one minute,after 1 minuters then end call status ... press the number key, the green light will flash one time to show that key pressing success (if already pressed the number ... one time, sound ‘DI..’ for 3 times, then exit ID setting mode and return to setting status. 2.4GHz wireless audio intercom, one to one ...