The Oase HeatUp 25 Watt Aquarium Heater features uniform temperature level thanks to the patented bi-metal technology. 25 Watts. Recommended for tanks up to 10 gallons. Glass construction. Fully submersible. Suction cups and bracket for securing to the aquarium. Adjustable temperature control. The heating function is displayed via the activated control light. For use in fresh and saltwater aquariums. 8" long. UL listed. Made in Italy.