[Betta Heater]This aquarium heater should be 100% submerged in water, ideal for small glass or acrylic desktop aquariums up to 1-6 gallons, not suitable for tanks under of 1 gallon. [Quick and Easy Installation]: Vertical or horizontal placement using 78°F aquarium heater automatic temperature control, no need to adjust the temperature, easy to use, fish are happy. [How It Works]: Plug in, the red light will turn on, the heater will start working until the water temperature reaches 78°F, and the red light will turn off, then the light will green will light up, heating will stop working and stay constant temperature 78°F. Accuracy:±3°F [Note]: Do not operate or leave the product plugged in when your water tank is out of water, the water heater must be fully submerged in water. It is better to install a water pump to help the water circulate during heating.
