Appreciate your replys, The system I have is dated but still works fine, I have a Javenlin pro quad, Sensortronic VCR, two Vista monitors and four MagnaView dome cameras, I have aquired two more cameras and wished to add them by means of PIRs (I have a number of Redwall outdoor PIR`s) Just really wanted to know if it was possible to use the sensors to switch between cameras when activated.