- Overheating Protection and Power-off Memory Function: This fish tank heater automatically stops working if the water temperature exceeds safe limits, ensuring your aquatic pets are protected. It retains your last temperature setting, so after a power outage, it resumes operation without the need for manual adjustments. - USB Powered for Safety: Designed with a 5V/2A USB power supply, this heater eliminates the risk of electric shock to your fish. For optimal performance, use a compatible 5V/2A power adapter or power bank (not included). - Compact Size: Measuring just 5cm (1.97 inches) in length, this mini aquarium heater is space-efficient and easily concealable in your tank. It operates within a temperature range of 18°C-34°C, allowing you to select the ideal setting for your aquatic environment. - Precise Temperature Regulation: Featuring advanced smart inverter technology, this heater maintains a consistent temperature through a built-in chip, offering more accurate control compared to traditional knob models. The easy-to-read display ensures you can monitor the water temperature at a glance. Use Scenarios: - Ideal for small aquariums or fish bowls, enhancing the comfort and health of your fish by maintaining a stable temperature. - Perfect for aquarists who frequently experience power outages, thanks to its memory function that saves your preferred settings. - Great for hobbyists looking for a compact and efficient heating solution that blends seamlessly into their aquarium setup.