Specification: Item Type: Fish Tank Heating Rod Material: Plastic + Quartz Glass Size: Approx. 32cm / 12.6in (Sleeve into the protective case to measure the size) Voltage: US Plug 110V‑120V Waterproof Rating: IP68 Power: 200W Temperature Control Range: 20-34°C / 68-94 °F, 68-94°C / 154-201°F (please allow an error of 2 degrees) Applicable Water Tank: 80-150L Applicable Fish Tank Size: 60-80cm / 23.6-31.5in Package List: 1 x Heater 1 x Shell 1 x English Manual Note: If the product is completely submerged in the water and still displays E1, the heating rod needs to be rebased. 1. When the heating rod is not powered on, put the heating rod in the water, press the temperature controller with one hand and hold it down, connect the power with the other hand, and release the button after powering on. At this time, the LED display number has been changing, and short press again Press the key once. 2. Lift the heating rod out of the water, short press the button once again to complete the calibration, put it in the water, the heating rod will return to normal working state, (at this time, the heating rod displays Celsius, if you need to convert to Fahrenheit, you need to long press the control (3 seconds) In order to use this product reasonably, the best service period is one year! Exceeding it will easily lead to slow heating and material aging! Please replace it in time! 3. Please allow 1‑2cm / 0.4‑0.8in error due to manual measurement.