The aquarium heater is low and the temperature is adjustable. Suitable for saltwater and freshwater, 30-40cm small aquariums. feature: Mini heater: the aquarium heater is small in size, 19 cm long High quality: The aquarium heater uses high-quality quartz glass, double-layer sealing materials and advanced design to ensure safe operation. < p>Quick and easy installation: vertical or horizontal placement, the aquarium heater automatically controls the temperature of 78°H, no need to adjust the temperature, easy to use. The aquarium heater must be 100% submerged in water. Power: 25W Convenient and safe: the aquarium heater has two suction cups, which can be attached to the aquarium. Both types of aquariums are suitable for fresh or salt water and provide a continuous warm environment for your tropical fish to maintain their health. Feature: Product Name: Aquarium Heater Material main: quartz Optional power supply: 25W Voltage: 220 V-240 V (EU)