The HYDROS Control X4 Pro Pack, which includes TWO control devices for the ultimate failsafe, will help you master aquarium automation. You can monitor temperature, water level, pH, ORP, and other variables with the Control X4 thanks to its ability to connect up to four sensors and two probes. The Control X4 also has two Command Bus connections for connecting to and interacting with other HYDROS devices, as well as two Drive connections for powering pumps and solenoids. The Control XP8, the second controller that comes with the aquarium, has 8 120V AC outlets for powering and monitoring the vital life support components. Both devices have the ability to send messages and warnings, as well as link to up to 8 WiFi devices for further modular control on other pieces of equipment including lighting, pumps, and feeds and more by simply adding a HYDROS WiFi Power Strip or HYDROS Smart Plug (both sold separately).