Feature:1. Superior Performance: The aquarium heater controller displays real time water temperature and set temperature at the same time, which is more convenient than the in type thermometer.2. Adjustable: The temperature can be adjusted between 20‑34°C and 68‑94°C. You can freely adjust the temperature setting to allow the temperature within 2 degrees of difference.3. Automatic System: Automatic heating when the water temperature is lower than the set temperature, stop heating when reaching the set temperature.4. Convenient to Use: 500W aquarium heater, voltage: 110 120V, with removable and 2 suction cups. It is easy to hide in water tanks (acrylic or glass).5. Easy Installation: Use 2 suction, and please place it vertically or horizontally so that it is fully immersed in water before turning on the power. And installed near the area to prevent uneven heating.How to Use:1: The display blinks digitally for three seconds after the initial power‑on to display the current setting temperature.2: Setting the temperature: press the button on the power cord gently, the display screen flashes and enters the setting mode, press the switch to set the temperature (temperature range: 20‑34 ℃(68‑94 °F), set the temperature to the value you need, release it for 5 seconds, automatically save the temperature you