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Safe for freshwater and saltwater aquariums. Submersible heater features:Temperature control knob that maintains temperatures between 68 - 89.6 degrees Fahrenheit (20-32 degrees Celsius).Temperature setting indicator.Water level indicator lineHas On/Off lightHeavy-duty heat and shock-resistant glass tubeIncludes heater holder with suction cups to secure heater to aquarium wallUL-listed120V 60HzLifetime guarantee