The ICM-600 has the ability to expand a controller's stations to an additional 6 stations. The Hunter I-Core modular controller has 4 bays that can be used to install 4 ICM-600 expansion modules. The plastic cabinet IC-600-PL can be expanded up to 30 stations. The metals cabinets, IC-600-SS, IC-600-PP, and the IC-600-M can be expanded up to 42 stations.