- Overheating Protection: The fish tank heater automatically shuts off if the water temperature exceeds the maximum limit, ensuring your aquatic pets stay safe. It features a power-off memory function, recalling your last temperature setting after a power interruption. - USB Powered: This heater operates on a safe 5V/2A USB power supply, eliminating worries about electric shocks to your fish. Connect it to any 5V/2A power adapter (not included) or a compatible power bank (not included) for hassle-free operation. - Accurate Temperature Control: Equipped with smart inverter technology, this heater maintains a stable temperature using an advanced built-in chip. The precise temperature display is easy to read, offering clear visibility of water temperature conditions. - Compact Design: Measuring just 5cm (1.97 inches) in length, this mini aquarium heater is perfect for small tanks. Its discreet size allows for simple integration into your aquarium setup. Choose the American Fahrenheit model with a temperature range of 64-93°F or the Celsius model with a range of 18-34°C based on your needs. Use Cases: 1. Ideal for small fish tanks, providing consistent heating for tropical fish that require stable water temperatures. 2. Perfect for temporary setups, such as quarantine tanks or breeding tanks, where precise heater control is essential. 3. Suitable for hobbyists who need a compact and efficient solution for maintaining optimal conditions in their aquariums. This fish tank heater combines safety, convenience, and reliable performance, making it a must-have for any aquarium owner.