Material: Plastic Size: 18*85mm/ 0.71*3.34inch Color: Black Feature: 1. Intelligent constant temperature heating: The mini heating rod adopts automatic constant temperature technology to accurately control the water temperature of the aquarium and provide a stable growth environment for fish. 2. Compact and portable design: It is small in size, easy to install and hide, does not occupy the space of the fish tank, and is suitable for various small aquariums. 3. High efficiency and energy saving performance: Low power consumption heating technology, rapid heating while reducing power consumption, long-term use is more economical and environmentally friendly. 4. Safety protection upgrade: Equipped with anti-dry burning protection function, it automatically stops working when the heating rod is out of the water to ensure the safety of the equipment and the fish tank. 5. Select high-quality corrosion-resistant materials, and adaptable to various water conditions. Note: 1. Manual measurement may have an error of 1-2cm. Please understand, thank you. 2. Due to the difference between different monitors, the image may not reflect the actual color of the item. Package includes: 1* automatic constant temperature heating mini heating rod for fish tank