This aquarium heater with an external temperature controller is easy to adjust the fish tank water temperature providing a comfortable environment. With automatic constant temperature, overheating, and water shortage protection that is practical and safe to use. ?Save Energy?This aquarium heater features an automatic constant temperature that will automatically stop heating when it reaches the set temperature. Energy-saving and eco-friendly. ?Mini Size?This aquarium heater is designed with a compact size that is portable and easy to install. Also, the package comes with mounting suction cups. ?Excellent After-Sales Support?For any inquiries or concerns, please don't hesitate to contact us. Our dedicated service team is committed to providing professional and satisfactory assistance to ensure your utmost satisfaction. Parts List: 1×Aquarium Heater(with mounting suction cup) Specification: Name: Aquarium Heater Material: ABS, other electronic components Heating rod length: 10cm/3.93inch Plug to switch lead length: 30cm/11.8inch Switch to the heating rod body wire length: 100cm/39.3inch Power: 25W / 50W Temperature display: Fahrenheit Plug specification: US Standard Note: 1. Please do not immerse the temperature controller in the water and do not press the button with wet hands avoiding electric shock. 2. There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color 3. Please allow slight dimension differences due to manual measurement.

?Overheat and Water Shortage Protection?This aquarium heater features overheat and water shortage protection that will automatically shut down when the heater is short of water or overheat. It is safe to use and protective of the fish tank avoiding damage due to the high temperature. ?External Temperature Controller?This aquarium heater with an external temperature controller is easy to use. Put the temperature controller on the aquarium outside without touching the water. The wire length is long enough for your needs. Just put the heating rod into the water and come with suction cups, easy to install. Please do not immerse the temperature controller in the water and do not press the button with wet hands avoiding electric shock. ?Automatic Constant Temperature?This aquarium heater adopts an advanced intelligent frequency conversion technology that can keep the fish tank water at a constant temperature. The heater's working frequency will change as the temperature variation. And the aquarium heater will auto-stophe heating when it reaches the set temperature. Energy-saving and eco-friendly. ?Built-in Temperature Sensor and Memory Function?This aquarium heater features a built-in temperature sensor, and the water temperature will be displayed on the external temperature controller. No need to buy extra aquarium thermometers. Also, with the memory function, the aquarium heater will remain at the temperature last time used. No need to reset the temperature after powering off. ?Available 10W/25W/50W Aquarium Heater?2 power style aquarium heaters available for choosing: 10W, 25W, 50W. The 25W aquarium heater is suitable for 1-5 gallon aquariums, the 50W one is suitable for 3-10 gallon aquariums. With a compact size design, it is easy to hide in the aquarium without taking up much space. The temperature range is from 64 to 93°F. Suitable for both saltwater and freshwater.