Aqueon Small Aquarium Fish Tank Submersible Mini Flat Heater up to 2.5 to 5 Gall

2, heaters. Only used about a week decided to change our set up. Fully submersibleVertical or horizontal placement using suction cups that mount to the bottom or side wall of tankQuick and easy installationShatterproof constructionCan be used with glass or acrylic enclosuresNote: Do NOT operate or leave product plugged in when it is outside of waterWarms aquarium water up to 6°F above ambient room temperatureIdeal for desktop aquariums up to 3 gallonsAquatic 7.5 Watt Flat Heaters provide warmth for small tropical fish and are designed for glass or acrylic desktop aquariums up to 3 gallons. They are completely submersible, easy to install and efficiently warms aquarium water. Suctions cups are included so you can mount the heater to the bottom or side wall of the aquarium. Be sure to choose the appropriate size for your aquarium. Do not operate or leave product plugged in when it is outside of water. Perfect for everyday use. premium materials and excellent craftsmanship ensure long-lasting durability.