Aquarium heater: aquarium heater has a double-layer sealing head, a waterproof and leak-proof design that can maintain the set temperature accurately and safely. Create a warm living environment for the fish in the aquarium in the cold winter.Premium aquarium heater: the aquarium heater is made of 0.5 mm thick 304 stainless steel, is not afraid of rust, collision-proof and explosion-proof. In addition, the aquarium heating rod uses a nickel-chrome electric heating wire with better thermal conductivity, making the heating speed faster and more stable. Note: When cleaning the heating rod aquarium, please turn off the power 15-20 minutes in advance to cool it and avoid burns.Temperature adjustable: the temperature of the aquarium heater is moderate, and the aquarium heating rod can be adjusted from 18 C to 34 C (64 F to 93 F), the adjustment accuracy is high and can meet the requirements of different environments. You can adjust the heating temperature according to the actual needs. The indicator light lights up indicates that the heating process is taking place. Note: The aquarium heater must be completely immersed in water.Automatic shut-off in case of overtemperature: intelligent temperature control of the aquarium heating. Shrapnel for temperature control + silver plated contacts for precise temperature control + powerful magnets to prevent demagnetization, automatic shut-off when over temperature, silver plated contacts are more sensitive and the temperature difference error is small. Aquarium heater is very suitable for fish tanks and aquarium in any household.Easy installation: can be placed at any angle, please immerse the heater completely in water. When the aquarium heater is in operation, it is recommended to install a water circulation system to achieve a better balance of aquarium temperature. Do not insert the aquarium heating rod into the gravel so as not to affect the temperature control.