Heating rod (length 12cm, diameter 2cm) power: 25w Product features: universal for seawater and fresh water, automatic constant temperature of 26 degrees, can be used in low water level, small and short product. Note: 1. The heating rod must be completely immersed in water and placed in a place with smooth water flow. 2. Do not insert the heating rod into the sand for use 3. Please place the thermostat in a dry place 4. Do not let children touch and play with it 5. Do not disassemble the product by yourself. Warm reminder, in order to avoid misunderstanding, please see below. About the temperature difference of the heating rod: If the water in the fish tank is shallow and the area is relatively large, the heating range can only be close to the water body near the heating rod. The farther away, the lower the temperature, it is recommended to use a filter. This is not an experiment conducted by the Chinese Academy of Sciences to warm organisms. There is a temperature difference of one