1、Memory of Power Failure: Heater will automatically restore the previous settings after power failure, and there is no need to set the temperature again to avoid forgetting to adjust the temperature after power failure. 2、Intelligent Temperature Control: Fish tank external heating rods has intelligent IC chip, precise temperature control, small temperature difference, over temperature protection system and safer heater. 3、LED Display: Fish tank external heating rods have LED display, which is convenient to operate, high end appearance, precise waterproof and outstanding sealing effect. 4、Safety Design: Aquarium external heating rods adopts over water heating design, which truly separates water from electricity and prevents the danger of electric leakage. 5、Premium Material: The shell of aquarium external heating rods is made of premium plastic, which is durable, not easily damaged and has a long service life. Item Type: Aquarium External Heating Rods Material: Plastic Size: Approx. 88x73x185mm / 3.46x2.87x7.28in Nozzle 1 Diameter: Approx. 18mm/0.71in Nozzle 2 Diameter: Approx. 22mm/0.87in Use: External Heater for Fish Tank Control Range: 20℃-34℃ 1 x Aquarium External Heating Rod 4 x Water Nozzle 6 x Washer 2 x Reinforcing Pipe 2 x Fixing Hoop