High-quality material: The aquarium heating rod itself is made of waterproof components and thickened quartz glass. The material is delicate and shiny, unbreakable and durable, and the internal components are clearly visible. The \"On\" indicator in the middle allows you to clearly see if the product is working correctly and creates a warm living environment for the fish in the aquarium. Adjustable constant temperature: The aquarium heating rod uses a high-strength heating wire to maintain a constant temperature, and the top is equipped with an adjustable knob. You can adjust it to the environment and water temperature in the aquarium; the temperature range is 20 to 34 degrees Celsius. Easy to use: Easy to install and easy to use. High-temperature resistant quartz glass tube with temperature display, high safety. Strong stability. Double layer of waterproof protection, fully submersible design, can accurately maintain the set temperature. Warning: After receiving the product, as it is a glass product, it is necessary to first check for damage. If it is not damaged, the product should be unplugged and placed in water for 24 hours to observe if water penetrates. If there is no water penetration, this indicates that the product is not damaged. If water penetration occurs, please contact us for a replacement to ensure safety.