Can the multiple cameras be used in separate rooms?

Hi there, thank you for your inquiry, the OBH500 is Multi camera capable (4 for parent unit/ 10+ for App) I have added alink below to the camera that is suitable for this. https://www.babyonthemove.co.nz/products/nursery/baby-monitors/oricom-hubble-hd-smart-camera/

I hope this helps