Description: When the water temperature is 0.1 lower than the set temperature, it will enter the temperature control state, and the H indicator will turn on yellow when the water temperature exceeds 36C, until the temperature returns to below 34C and the normal volume will be resumed. Specification: Name: USB Fish Tank Heater Size about: Overall length: 140cm/55.11 inches. Heating rod: 2.5*2.5*6cm/0.98*0.98*2.36 inches Material: nickel chrome wire Weight: about 89 grams Power: 15W Precautions: The heating rod must be fully submerged in the water when using it. Please do not touch the heating rod during normal operation. 1. Check the display screen regularly to see if there is an alarm or other abnormal phenomenon. 2. It is forbidden to open the protective cap of the heating rod, otherwise, the seal may be damaged and the heating rod will be damaged by water seepage. 3. The temperature control switch should not be soaked in water or close to the fish tank to prevent water from infiltrating Packing List: USB fish tank heating rod*1