Over-temperature protection system, when the water temperature exceeds 1 degree than setted temperature, the display shows E1 and the yellow-green light keep flashing and stop heating. Automatic constant temperature function. When water temperature reaches the setted temperature it will automatically stop heating. When the water temperature is lower than the setted temperature it will automatically heat. Cycle to maintain water temperature. Adjustable temperature. Accurate When the temperature reaches to the setted temperature range 1.5 degree, the power will automatically slow down and keep constant temperature. Insulation value of the provisional total power about 10% and play a role in automatically adjust power.
Power: 500W For 100-300L aquarium tanks