Not sure about your particular monitor, we have a Motorola and we plan on adding a camera for the new baby. I read somewhere, maybe on Motorola website, that the monitor cycles every so often from one room to the next ( ours I think every 8 seconds?) so yeah at the latest we will hear a crier 8 seconds later. Check your manufacturer's website or email them a question.
Re: 2 cameras on a monitor
Emily 8.8.08
Madeline 1.2.11
William 8.5.12