The HYDROS Control X4 Starter Pack by CoralVue is a complete, do-everything aquarium controller kit built around the flagship Control X4. One X4 monitors temperature, pH, ORP, and water level while controlling pumps, timers, and sensors — and this pack bundles the probe, sensor, and WiFi power strip you need to run it all from the free HYDROS app. Ideal for larger or more advanced saltwater, freshwater, and pond systems. What's included Control X4 unit Power supply Temperature sensor pH probe & calibration solutions 4-Outlet WiFi AC Power Strip HYDROS app (iOS & Android) What you can do out of the box Monitor temperature, pH, ORP, and water level; add more sensors to the four Sense Ports; power small 12V devices from the Drive Ports; integrate variable-speed pumps via 0–10V I/O; and switch equipment through the included WiFi Power Strip. Frequently asked questions Why choose the X4 pack? It's the most capable single-controller kit — one X4 covers temperature, pH, ORP, and water level plus Drive Ports and 0–10V control, with no add-on modules needed. Want more AC outlets? The X4 Pro Pack adds the eight-outlet XP8 controller and a Command Bus cable. Full X4 specs? See the standalone HYDROS Control X4 page. Shipped fast with expert support. Get your HYDROS gear from real reefers at Marine Concept Supply, with setup help when you need it and local pickup at our Wheeling, IL showroom.