Note 1. Must be used for diving and not allowed to be exposed outside. 2. Regional differences can affect the same power heater effect in different places will be different 3. It is not recommended to place it in a place where the water flow is very urgent or it will cause heat loss. 4. The closer the heating rod is, the higher the water temperature 5. The water temperature in the aquarium varies from day to day and night. 6. The heating rod power is better for the corresponding fish tank 7. For fresh water and sea water. Voltage: 220-240v Very very important!!!This product is only used for 220-240V voltage, please do not buy this product in 110V countries and regions, otherwise the product cannot be used normally, such as parts of Brazil, the United States, Mexico, Japan, Canada, Panama, Taiwan, etc., please carefully determine your local use voltage before purchasing!! The product will configure the appropriate plug for you according to your country IH INDUCTION HEATING: induction heating IH INDUCTION HEATING: induction heating is the principle of electromagnetic induction.The heat source is the basic principle. The working principle is to use the INVERTER circuit to change the current after pressing the switch The high-frequency current is supplied to the heating coil, and the high-frequency current of the heating coil It becomes a high-frequency magnetic field. Top Advantages 1.Over temperature protection Prevent high temperature cooking fish 2.When the temperature is greater than 34C.It Will forcibly stop heating. 3.Automatic power failure When the probe comes out of the water 4.IH heating system Use only one kilowatt-hour in two days Product external control to adjust heating, real-time power display