The Aqua One Glass Aquarium Heater is ideal for maintaining water temperature in your tropical or marine tank. It has an easy to read display and a simple dial for temperature adjustments. It is completely submersible and comes complete with suction cup feet for easy and convenient attachment to the side of your tank. It has a large temperature range from 20 degrees celcius to 34 degrees celcius making it suitable for a huge range of fish species. For ideal maintenance of your aquarium temperature, use the Aqua One Glass Aquarium Heater in conjunction with an external or internal thermometer to moniter your tank's temperature. The Aqua One Glass Aquarium Heater has a 2 1 Year Guarantee.