The Finnex Compact Electronic Titanium Heaters maintain water temperature within +/-2ºF 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.