... instruction: Press CALL. Number3, 4 button, and then connect to electricity, release the thress button until the RED,GREEN light bright ... and return to setting status.3. Transmitting CodePress number button 4, RED, GREEN light bright and enter into transmitting code ... intercom. When transmitting code, press number button 4 on master intercom,press number button 5 on extension intercom.Remark: When press ...