auomii Mini Submersible Aquarium Heater, 25/30/50/100/150/200 Watts Adjustable Fish Tank Heater, Built-in Thermometer, External Temperature Controller, Smart Memory, Used for 1-60 Gallons (30W Plug)

• Automatic Constant Temperature: 30W aquarium heater is specially designed for mini fish tank for 4-6 gallon,the heating will be automatically stopped when the set temperature is reached External Temperature Controller: Set the temperature via an external controller instead of submerging the hands in water and turning the dial Easy to Install: Thanks to the ultra-compact heater with powerful suction cup, it can be easily installed anywhere in the tank Easy to Read: The water temperature will be displayed on the external controller in real time, no need another aquarium thermomete Overheating Protection: Prevent cooking fish as overheating protection, stop heating automatically when overheating or lack of water