FULLY SUBMERSIBLE AQUARIUM HEATER: The HTG Series is a premier line of fully submersible glass heaters with added thermostat control. Maintain constant and stable temperatures for your aquatic creatures to thrive with this 300-watt fish tank heater. ADVANCED DURABLE DESIGN: The heaters offer a compact design for versatile placement, an LED indicator light, and are extra durable thanks to the built-in glass element. ADJUSTABLE TEMPERATURE CONTROL: The thermostat control of this heater for fish tanks makes it simple and easy to adjust the temperature setting. It has a range of 68-93 degrees Fahrenheit. GREAT FOR SALT & FRESHWATER USE: Aquatop's HTG Series is suitable for both freshwater and saltwater use. Perfect for fish tanks and turtle tanks up to 80 gallons. INCLUDED PROTECTIVE GUARD: Your aquatic life will have added safety thanks to the protective guard. The sturdy guard helps to protect the glass heater from accidental breakage from large fish or turtles.