Dymax Vortex Cooling Fan W-5 is a hang-on type cooling system which uses vortex technology with a conceal type design for safety purposes. Its elegant and stylish design can generate high cooling effect with low power consumption. Reduces temperature by up to 2~4 degree celsius from room temperature on DC voltage. Also useful for reducing humidity around automatic fish feeders positioned inside aquarium canopies. Rated Voltage: DC 12V Rated Current: 0.16A approxMax. Air Flow: 5.06CFM Accoustical Noise: <44.5dB