Rust and Corrosion Resistance: This aquarium heater is made of high-quality stainless steel material, which is sturdy, rust and corrosion resistant.Double-Layer Waterproof Protection Design: This aquarium heater features a double-layer waterproof protection and fully submersible design, allowing it to accurately maintain the set temperature without short-circuiting.Thermostatic Design: This aquarium heater uses a double-metal silver-plated contact temperature control with internal fixed temperature adjustment, offering high temperature sensitivity and minimal temperature error.Wide Temperature Range and Deep Submersion: This aquarium heater is adjustable from 18 to 34 degrees Celsius, with a maximum immersion depth of 120 cm, suitable for freshwater aquariums.Strong Suction Cup Included: Equipped with a strong suction cup, this aquarium heater can be securely attached to the tank for long-term stability.