What’s the difference between the Concord 4, Concord Express, and Concord Ultra

Security System Help
1

Does anyone know what the difference between the Concord 4, Concord Express, and Concord Ultra are?

2

They are all different alarm systems, but they look similar.

3

Concord 4 is the better one because it’s newer, the express and ultra are ITI so it would only have one partition, as the GE/Interlogix would have 2 or more partitions.