colour1 门铃一拖一(门外按钮1+室内接收器1) ,
Colour1 doorbell one by one (outside button 1+ room receiver 1),
colour2门铃一拖二(门外按钮1+室内接收器2) ,
Colour2 doorbell one with two (outside button 1 + room receiver 2),
colour3 门铃二拖一(门外按钮2+室内接收器1)
Colour3 doorbell two drag one (outside button 2+ indoor receiver 1)