Features: Ensure the output of heat and keep the water temperature inside the tank steady. Visible temperature setting, easy and precise for setting the desired temperature. Temperature indicating scale can be adjusted between 20~34?(68~93.2F). Power indicator anti-explosion design ensure safe operation. Totally submersible, crystal glass body. Heating element is highly efficient and compact, completely safe for use. Can automatically adjust the temperature, good for fish in the aquarium.