【Small And Powerful】100W aquarium heater, length – 5.35 inch, is suitable for 10 to 20 gallons aquariums. Easy to use, red light on: heating, green light on: constant temp. Ideal uses for the marine saltwater and freshwater, fish tanks, turtle tanks, betta tanks, small ponds, and so much more. Please choose the right wattage aquarium heater according to our size chart
【External Temperature Controller】Use an external controller to set the temperature instead of immersing your hands in water to rotate the dial. Never wet your hands or contaminating your tank. Variable temperature settings range: 59-93℉. The controller shows 2 readings – the current temperature and the set temperature – very easy to switch by pressing the SET button and you save an extra thermometer for current temperature measuring
【Out of Water Protection】Full consideration of safety. Intelligent temp sensing, This fish tank heater will stop heating when the heater out of water, the controller will flash” Er” fault code. When the heater is completely immersed in water, it will start working automatically