Not to be trite, but if you read the directions, you'd see that you can set each unit to a different address specifically to avoid conflict with each other.
This is exactly why we complain about our industry lacking regulation and anybody with a pickup truck and a bag of tools can claim to be a CI.
"I have been marked once, my dear and let me assure you, no needle shall ever touch my skin again." -- Erik Magnus Lensherr (Magneto)
