The Finnex compact electronic titanium heater maintain water temperature within +/-2F of the set value providing a safe, healthy, and stable temperature for your tank. The titanium tubes are corrosion resistant, which makes these virtually unbreakable for both saltwater and freshwater aquariums. These ultra fast heating tubes are easy to hide as they are compact in size and also include a precise electronic control with hang on hook. There is also a LED heating indicator to let users know when the heater is functioning. The titanium heating element is engulfed in a protective guard to ensure the safety of both the aquatic inhabitants and surrounding equipment. Suction cups included.