High-quality material: The heating rod for the aquarium 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 light in the middle allows you to clearly see if the product is working correctly and creates a warm habitat for the fish in the tank. Adjustable constant temperature: The aquarium heating element uses a high strength heating wire to maintain a constant temperature, and the top is equipped with an adjustable rotary knob. You can adjust it to the environment and temperature of the water tank, the temperature range is 20-34 degrees. Easy to use: Easy to install and easy to use. High temperature resistant, explosion-proof quartz glass tube, with temperature display, high safety. 【Strong Stability】Double layer waterproof protection, fully submersible design, can accurately maintain the set temperature. 【Usage】The maximum immersion depth is 120 cm. This product is only suitable for use in fresh and salt water.