FISHKEEPER AQUARIUM HEATER How to make our beloved fish live in a comfortable environment? This is a matter of concern. Without the right temperature, our fish will not be able to survive healthy. Fish Tank Heater for 80-220 Gallon Feature 1: Adjustable Temperature, Faster Heating, Temperature Adjustable Between 54-93°F. You can set the temperature to one of the following values on the dial by rotating the hands: 54,57,61,64,68,72,75,79,82,86,89,93Function 2: Automatic constant temperature function, when the selected temperature is reached, the constant temperature function is turned on to reduce power and save electricity.Function 3: The betta fish tank heater is made of 2mm thickened quartz glass, which is 33% thicker than ordinary glass. Shatter-resistant, corrosion-resistant, and usable in fresh and salt water.Function 4: The internal material is updated and upgraded, the ceramic heating body is used, the resistance is low, the heating is fast, and the power is more energy-saving. The 3C power cord, power plug, and authoritative certification are safer.Function 5: 800W fish tank heater, suitable for 80-220 Gallo fish tank, double heater, faster heating speed than ordinary heating rod Strictly Seal the Top IPX8 design, no need to worry about water seepage, Every plastic part of the aquarium heater is made of durable, high-quality, BPA-free plastic. The heating process produces no invisible toxins. That means it's not only safe for your fish, it's also safe for you. Explosion-Proof Quartz Material The heater is made of explosion-proof glass material and high temperature resistant nickel-chromium heating wire, with silicon carbide thermal conductivity.Explosion-proof quartz glass, 33% thicker than ordinary glass, no deformation or softening, multi-layer sealing, waterproof and no leakage Super Suction Cup The heating rod comes with 2 strong suction cups, which can be securely fastened to any corner of the fish tank and will not fall off.We recommend regular cleaning, if you find that the heater or accessories are covered with soil or moss, turn off the heater and clean with fresh water after 15 minutes ABS Shell, Multiple Protection The black shell is a high temperature resistant ABS material that protects the fish, keeping your aquatic life and you from scalding.We recommend regular cleaning, if you find that the heater or accessories are covered with soil or moss, turn off the heater and clean with fresh water after 15 minutes The package includes: 1 * Aquarium heater2 * suction cups1 * protective case1 *User Manual Note: 1. The fish tank temperature is easily affected by room temperature, so it makes the water temperature inaccurate, there will usually be a ±3°F difference from the exact temperature from 54 to 93°F.2. Please place the fish tank heating rod correctly, 100% fully immersed in the water, Suggestions: 1. To help the heater work more efficiently, please use the heater in a circulating water tank, the still water will make the water temperature in the heater area higher than the other side.2. Before changing the water or cleaning the fish tank, please unplug the power plug and then take out the fish tank heater.