Fully Submersible. Power: 50W. Suggested water volume: 10-20 gal. | Adjustable Temperature: The temperature of the fish tank heater can be adjusted automatically. Temperature setting range: 65° F - 93° F(20°C~34°C), and the display is easy to read. | High Quality: Aquarium heater made of high quality quartz glass, double seal material , advanced design, ensures safe operation.Fully suiting for fresh or saltwater aquariums, provide a constant warm environment for your tropical fish to stay healthy. | Set desired aquarium temperature & on/off indicator light confirms operation. *On/off indicator light allows simple, visual confirmation of heater operation. | Convenient and Safe: Our aquarium heater thermostat has two suction cups for attachment to the fish tank. The polarized plug prevents electrical shock.