Note: When using this heating, the heating should be submersible in the water and should not be exposed to the water surface.It is necessary to regularly clean and clean the heating plate. If the heating plate is attached with impurities, the heating efficiency will be reduced. It can fully convert electric energy into heat energy, saving energy and safety. Can be used for freshwater. After the water evaporates, the heater is exposed to the water surface, it will automatically cut off the electricity. Over-temperature protection system, when the temperature in the tank is over 97 °F will stop heating, to avoid fish from boiling fish due to high temperature. Three-digit digital display, accurate to 0.1 °F, easy to grasp the temperature value and working status. Three-pin plug, prevent electric leakage and electric shock. A double temperature probe prevents the single temperature probe from being damaged and causing no heating or over temperature. Automatically remember the temperature, when used after a power failure, the temperature no need to set. The outer casing is made of ABS material, which and can withstand certain gravity, effectively preventing damage caused by fish. A strong suction cup bracket, can stably fix the heater in every corner of the fish tank.