Temperature setting:After pressing slightly the button on the line,the display screen will flash and enter the setting mode.Then the user can press the button to set the temperature(temperature range:20-34℃,(68-94℉))needed and then release the button.After 5s,the temperature set will be saved automatically and the real-time water temperature in the fish tank will be displayed.When the heating rod detects that the water temperature is higher than the temperatureset,the heating rod will stop working;When it is 2℃(4℉)lower than the temperature set,the red indicator will be on,the heating rod starts to heat the water and stop heating when it reaches the temperature set.