... code setting instruction: Press CALL. Number3, 4 button, and then connect to electricity, release the thress button until the RED,GREEN light ... : on the above steps, press number button 3 to coding, numberbutton 4 to transmitting code, the Number button 3, 4 should ... master intercom, then accordingly press number button 5 onextension intercom to enter into receiving code status. For example:When coding ...