Hygger 300W Submersible Aquarium Heater with Digital Controller & Auto Shut Off - Fish Tank Heater for 40-65 Gallon Freshwater/Saltwater Reef Tanks - Perfect for Tropical Fish, Marine Life & Coral Care

Multifunctional External Controller Display available in either Celsius or FahrenheitShows current water temperature and set temperatureIndicator light let you know heating statusAudio alert if anything goes wrong Easy To Set - No Wet Hands Single Quartz Glass Dual Heater Tube(300W/500W) 1 Perfect for Used in Freshwater & Saltwater Aquariums High And Low Temperature Alert Heater Rod Must Be Fully Submerged

[Safety Auto Off, No Cooked Fish] If the water level drops too low and exposes the temperature sensor to the air, hygger aquarium heater auto shuts off with controller flashing "E1" error code and beeping alert to prevent overheating

[Multi-Functional External Controller] 1. Easy to read digital display shows both real-time water temperature and set temperature which available in either Celsius or Fahrenheit. 2. Red indicator light let you know its heating and green at temperature. 3. Audio alert remind you something is wrong. 4. Easy to set temperature without getting hands wet

[Corrosion-Resistant Quartz with Protective Guard] hygger 300/500w aquarium heaters equipped with single heater tube in which made of premium corrosion resistant and shatter-proof quartz glass, suitable for fresh or marine water; Integrated protective guard protect fish and other livestocks from burning

[Alarm for High and Low Temperature] Auto shut off as well as beeping alarm when water temperature lower than 59°F or higher than 95°F, resets when water temperature back to control temperature range between 59°F~93°F

[Choose the Right Heater According to Tank's Size]voltage 110V, 300 watt aquarium heater for 40-65 gallon tank, 500 watt aquarium heater for 66-132 gallon tank, 800 watt aquarium heater for 106-211 gallon tank, 1000w aquarium heater for 159-317 gallon tank, suitable for fresh water and marine water