... on the above steps, press number button 3 to coding, numberbutton 4 to transmitting code, the Number button 3, 4 should be ... When coding for two intercoms, should press number button 3 on themaster intercom, press number button 5 on extension intercom. When transmitting ... intercom,press number button 5 on extension intercom.Remark: When press number button, it will be available within 4 seconds, will ...