- Elegant and typical, beautiful and generous 2. Ultra-quiet design, the noise is 30% lower than before 2. Hanging design, safe and stable 3. Using DC12V direct current, safety guarantee 4. The coil is far from the water surface of the aquarium and does not cause a risk of short circuit 5. Strong wind, depending on the weather and indoor temperature, the temperature can be reduced by 2-4°C Type designation Air outlet Voltage Current Dimensions (unit: cm) WW-F1 a DC12 0.2A 10.5137 WW-F2 two DC12 0.4A 20137 WW-F3 Three DC12 0.6A 29137 WW-F4 Four DC12 0.8A 39137