Temperature Control: The temperature adjustment range is 18C to 34C (64F to 93F). When the water temperature is lower than the set temperature, the aquarium heater will automatically start heating until the water temperature reaches the set temperature, keeping the water temperature constant. Intelligent Control: Externally controlled electronic temperature adjustment, using intelligent frequency conversion technology. Three-digit display for precise temperature control, with 0.5C 1 adjustment accuracy. Digital Displays: The digital display on the heater will show the current water temperature, the digital display on the controller shows the current water temperature and the set temperature. When you want to check the water temperature, you can see it on the heater or the control screen. Wide Application: Suitable for freshwater aquariums under 4 liters, saltwater aquariums, betta aquariums, micro aquariums, turtle aquariums, horned frogs, tropical fish, and other mini aquariums for heating.