Features Aquatop's DDC-800 Digital Controller offers precise control to ensure stable water temperatures for all aquatic livestock. With a highly visible dual digital LED display the DDC-800 includes adjustable high and low temperature settings with audio alerts. This advanced controller utilizes heavy-duty three-prong receptacles and offers overheating protection. Each unit is equipped with a dual relay interwork that doubles the protection and safety of aquatic life by disabling the heating element in case of overheating. This highly accurate digital controller eliminates temperature fluctuations and is the perfect addition for saltwater and freshwater systems. Can be used with the Aquatop TH-500 or TH-800 Titanium Heater.