Feature: 1. Premium Material: Aquarium heater is made of glass and plastic material, strong and durable, corrosion resistant, long service life. 2. Fast Heating: Aquarium heater with mechanical quartz heating rod inside, fast heating, energy saving, safety and explosion proof. 3. Knob Type Adjustment, Clear Scale: Fish tank heater adopts knob type adjustment, the temperature is accurate and convenient; clear water level scale, safe and eye catching. 4. Intelligent Temperature Control: Fish tank heater adopts intelligent temperature control technology, power saving core technology, iron chromium wire rapid heat conduction, energy saving and power saving. 5. Constant Temperature Mode: Submersible glass water heater heating one hour, constant temperature three hours, intelligent constant temperature mode. 6. Waterproof Design: Submersible aquarium heater adopts three layer sealed waterproof design, IPX8 safety waterproof without leakage. Fresh water, seawater are applicable. Specification: Item Type: Aquarium Heater Material: Glass, Plastic Use: Fish Tank, Aquarium Heating Rod. Package List: 1 x Aquarium Heater2 x Suction Cups Note: 1. Use the heating rod completely submerged in water, to prevent burning the rod body, melting the protection shell and other situations cause unnecessary trouble.2. Because the heating rod heating speed is fast, try to place the heating rod in the position of rapid water flow to let the fish tank evenly heated.3. It is not recommended to use the heating rod in the bottom filter, because some bottom filter water level is not enough to submerge the rod body, and lead to accidents.4. Please do not bury the heating rod in the bottom of the fish tank gravel mud, because the gravel and water have different specific heat capacity, which will lead to damage to the heating rod.5. The heating rod will work with a slight electrostatic (12V or less) is safe, please rest assured that the use.