Mini Aquarium Heater 5W – Submersible Betta Fish Tank Heater USB Powered, Adjustable Temperature for 4–6 Litres Tanks.

Temperature range adjustable - Thanks to advanced Intelligent Frequency Conversion Technology, the water temperature can be kept constant with an accuracy of 1°C. The heater's working frequency will be changed according to temperature variation, and the heating is automatically stopped when the set temperature is reached. Compare to traditional heater, this new technology will cut down electricity bill for you. Overheat & Dry-Run Protection – Engineered with full safety in mind. This aquarium heater automatically shuts off when the water level drops below the minimum or when the water temperature exceeds 36.1 °C , offering peace of mind and protecting your fish from overheating. No more worries about accidental “fish stew”! (Note: The heater must be fully submerged during operation.) Effortless Operation – Equipped with durable suction cup for secure placement, this heater is quick to install and simple to use. Just fully immerse the heating rod in water, and it begins heating automatically. LED Temperature Display - Built in display, indicates operating temperature. Multi-purpose – This heater can be used for both fresh and marine water. It can be not only used as an aquarium heater, but can also work for turtles, pet fountains, and plant seedling.