Feature Highlights: 1. Smart Auto Temperature Control: This mini heater uses automatic constant temperature technology to accurately maintain your aquarium's water temperature, providing a stable and healthy environment for your fish. 2. Compact & Space-Saving Design: Its small and slim size makes it easy to install and discreetly hide. It won't clutter up your tank, making it perfect for various small aquariums and nano tanks. 3. Energy-Efficient Operation: Built with low-power consumption technology, it heats water quickly while saving on electricity, making it an economical and eco-friendly choice for long-term use. 4. Enhanced Safety with Dry-Burn Protection: Equipped with a safety feature that automatically shuts off if the heater is taken out of the water, protecting both the device and your aquarium from potential damage. 5. Durable & Adaptable Construction: Made from high-quality, corrosion-resistant materials to ensure longevity and reliable performance in different water conditions. Product Details: This automatic constant temperature mini heater is designed for small fish tanks. It keeps the water temperature steady for your fish, is easy to install and hide thanks to its compact size, and runs efficiently to save energy. The built-in dry-burn protection adds an extra layer of safety. Crafted from durable, corrosion-resistant material, it's a reliable and low-maintenance solution for keeping your aquarium at the perfect temperature. Specifications: Material: Plastic Size: 18mm x 85mm / 0.71inch x 3.34inch Color: Black Package Includes: 1 x Automatic Constant Temperature Mini Aquarium Heater Note: 1. Please allow a slight manual measurement error of 1-2 cm. 2. Slight color variations may occur due to different monitor settings.