The hygger 500W Titanium Steel Aquarium Heater is an energy-saving, durable heater that is perfect for use in freshwater fish tanks. With a max heating mode and an eco heating mode, this heater provides fast heating and efficient heating, respectively. The heater also features dual digital displays on the controller and the heater, as well as an automatic shutoff function when the temperature reaches 97 degrees Fahrenheit. The hygger 500W Titanium Steel Aquarium Heater is made of durable titanium steel and is protected by a sturdy plastic guard. It is easy to install and is perfect for use in freshwater fish tanks.