The GH Series offers simple and easy installation with the use of included suction cups. With the highly visible temperature setting, the GH Series is easy to set and adjust to the desired temperature with the use of the Temperature Adjustment Knob. These powerful heaters have water-proof double insulation and are made from high quality insulated glass. The GH Series is available in multiple sizes, and all models are suitable for fresh and saltwater use. Aqua Top's GH Series will aid in maintaining constant and stable temperatures for your aquatic creatures to thrive!