- Availeble in 2 and 4 Fans. - Low noise. - A high effect of cooling and saving of energy. - 10 times stronger wind power compare with the common fan. - Secure switch design, 12V DC. - Made from high quality plastic material, easy installation. - Wind direction is adjustable and is suitable for all kinds of fish tank - Ability to lower the temperature to about 3~4 ℃. - This is an essential piece of equipment in hot weather.