Experience precise temperature regulation in your aquarium with the D-D Dual Heating Cooling Controller, a sophisticated solution for both novice and expert aquarists. This controller is designed to work seamlessly with the included 300w Titanium Heater, ensuring your aquatic environment is maintained at your preferred temperature. Brand new bought as was planning to set up marine tank but due to health issues I am no longer doing this. Temp control also comes with mounting bracket for the controller. any questions please ask. Will dispatch fast.