Specification: Item Type: Aquarium Heating Rod Material: ABS+Quartz Glass Heating Rod Size: Length 13.3cm / 5.2in x Width 7cm / 2.8in x Height 3.5cm / 1.4in, Manual Measurement Will Have An Error Of 0.5-1cm / 0.2-0.4in (The Size Of Heating Rods Of Power is The Same) Temperature Control Range: 17°C-34°C Package List: 1 x Heater 2 x Sucker 1 x Manual Note: 1. Use of heating rod: completely immersed in water to prevent unnecessary trouble caused by burning the rod body and melting the protective shell. 2. Because of the fast heating speed of the heating rod, the heating rod should be placed in a position where the water flow is as fast as possible to heat the fish tank evenly. 3. It is not recommended to use the heating rod in the bottom filter, because some of the bottom filter water level is not enough to immerse the rod body, which may cause accidents. 4. Do not bury the heating rod in the sandy soil at the bottom of the fish tank, because the specific heat capacity of sand and water is different, which will cause damage to the heating rod. 5. When the heating rod is working, there will be slight static electricity (below 12V), which is a safe range, please rest assured to use it.