Feature: 1. DURABLE MATERIAL: The appearance is made of glass and plastic, with mechanical quartz heating rod inside, fast heating, energy saving and power saving. 2. QUARTZ TUBE: Aquarium heater has safe explosion proof thickened quartz tube, stable and heat resistant, knob type adjustment, precise and convenient temperature, clear water level line scale, safe and eye catching. 3. POWER SAVING: Fish tank heater adopts mechanical intelligent temperature control technology, power saving core technology, iron chrome wire fast heat conduction, energy saving and power saving. 4. WATERPROOF DESIGN: Submersible fish tank heater adopts three layer sealed waterproof design, IPX8 safety waterproof without leakage, durable and anti corrosion, freshwater and seawater are applicable. 5. INTELLIGENT CONSTANT TEMPERATURE: Fish tank heating rod intelligent heating, heating one hour, constant temperature three hours, intelligent constant temperature mode. Specification: Item Type: Aquarium Heater Material: Glass, Plastic Use: Fish Tank, Aquarium Heating Rod Plug Specifications, Voltage: US Plug 110V. 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 put 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 static electricity (below 12V) is safe, please rest assured that the use.