Material: Plastic Size: 18*85mm / 0.71*3.34 inch 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 provides rapid heating with reduced energy use, making it economical and environmentally friendly for long-term use. 4. Safety protection: Includes anti-dry burn protection that automatically stops operation 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 1-2 cm variation. 2. Due to differences in monitor displays, the actual item color may vary slightly from the image. Package includes: 1 x Automatic constant temperature mini heating rod for fish tank