MiOYOOW Mini Aquarium Heater, 10W 2 3L Fish Tank Heating Rod with Overheat Protection 5V/2A USB Ceramic Submersible Water Heater for Saltwater Freshwater

【Efficient Ceramic Heating】: Features advanced aluminum oxide ceramic heating elements for rapid and even heat distribution, improving heating efficiency. With high heat resistance, corrosion resistance, and excellent thermal stability, it is suitable for small freshwater and saltwater tanks. 【Precise Control & Digital Display】: Equipped with an external thermostat and LED digital display for real-time water temperature monitoring. Supports instant switching between Celsius (℃) and Fahrenheit (℉), ensuring precise temperature control and a stable tank environment. 【Multiple Protections】: Built-in overheat protection and smart frequency conversion technology automatically start or stop heating based on the preset temperature. The aquarium heater also features automatic power-off when out of water to avoid damage from dry use. 【Compact & Powerful Suction Cup】: Comes with a strong suction cup for stable installation, allowing either horizontal or vertical placement. The heater is compact, measuring only 5.2cm in length, saving space and fitting seamlessly into tanks up to 3 liters in capacity. 【Usage Notes】: This 10W heater must be used with a DC 5V/2A power adapter (not included in the package). It can heat water up to 3L in tank volume at room temperature above 18°C, and up to 2L when the room temperature is below 18°C.