Thermostatic Design --- This aquarium heater adopts double-metal silver-plated contact temperature control and internal fixed temperature adjustment process, which has strong temperature sensitivity and small temperature error. temperature. Double-Layer Waterproof Protection Design --- This aquarium heater adopts double-layer waterproof protection and fully submersible design, can accurately maintain the set temperature and will not short -circuit. Rust and Corrosion Resistance --- This aquarium heater is made of high quality stainless steel material, which is sturdy, rust resistant and corrosion. With Strong Suction Cup --- This aquarium heater with strong suction cup can fix the heater on the tank firmly and keep stable for a long time. < p>Wide temperature range and deep depth Height --- This aquarium heater can be adjusted from 18 to 34 degrees. Its maximum immersible depth is 120 cm and is suitable for use in fresh water.