[Betta Heater]This Fish Tank Heater should be 100% submerged into water, Ideal for small glass or acrylic desktop aquariums up 1 to 6 Gallons, not suitable for less than 1 gallon tank. [Quick and Easy Installation]:Vertical or horizontal placement using, Aquarium heater automatic temperature control 78°F, no need to adjust temperature, easy to operate, fishes happy. [How it Works]: Plug in, red light turns on, the heater will start working until water temperature up to 78°F, and red light off, then the green light will turn on, heater stop working and keeping constant temperature 78°F. Accuracy:±3°F [Note]: Do not operate or leave product plugged in when your water tank is out of water, heater should be fully submerged into water. Please install a water pump or filter to help water circulating while heating. [SATISFACTION GUARANTEED]Our Aquarium Heater is built with durability in mind and safety for every design. In the remote possibility that you’re not satisfied with our product,