Yes, there are 2 models. The ELK-M1G (Gold) has 16 main zones expandable to 208. The ELK-M1EZ8 is a smaller version with 8 main zones expandable to 200. Among the key differences are that the ELK-M1G has a built-in voice vocabulary, telephone remote, On/Off Switch, and Low Battery Cutoff which the M1EZ8 does not. The ELK-M1EZ8 is for smaller jobs although both panels share nearly the same security and automation programmability.