300W Aquarium Heater: suit for 40 to 55 gallon aquariums, the tank heater is 11 in length, 110-120V and 5 feet plug cable, the package comes with 2 pack fish tank heaters, 2 aquarium thermometers and several suckers Adjustable Temperature: aquarium submersible heater has an exact temperature scale of 68 to 93°F, complete control of the water climate within 1 degree of difference; Sensitive and reliable thermostat maintains uniform temperature, when red light on is heating, and automatic shutdown when temperature is reached With 2 Aquarium Thermometers: the immersion probe with suction cup can be easily put into the water, allowing you to better observe the temperature of the fish tank; Immersion probe only, do not immerse the thermometer in water Distinct Design: the aquarium water heater uses 2 mm thickened quartz glass, can be applied in fresh-water and saltwater aquariums, easy to hide in the tank, which is not easy to crack and safe for people and water animals Note: the fish
