Material: Plastic Size: 18*85mm / 0.71*3.34inch Color: Black Features: 1. Intelligent constant temperature heating: The mini heating rod uses automatic constant temperature technology to accurately control aquarium water temperature and provide a stable environment for fish. 2. Compact and portable design: Small size, easy to install and conceal, does not occupy tank space, suitable for various small aquariums. 3. High efficiency and energy saving: Low power consumption heating technology enables fast heating while reducing energy use, making long-term operation more economical and eco-friendly. 4. Safety protection: Includes anti-dry burn protection; automatically shuts off if the heating rod is exposed to air, ensuring safety for both equipment and aquarium. 5. Made from high-quality corrosion-resistant materials, suitable for various water conditions. Notes: 1. Manual measurement may result in a 1-2cm error. Please understand. 2. Due to differences in monitor displays, the image may not reflect the actual item color. Package includes: 1 x Automatic constant temperature mini heating rod for fish tank