Features: ❄ Two-gear Wind Control: According to the indoor temperature, the cooling fan is capable to reduce water temperature and drop up to 2 ~ 4℃. (The 5 heads fan and 6 heads fan have only 1 gear) ❄ Easy to Use: This fan can be directly clamped on the aquarium glass that the thickness within with 15mm, no additional installation methods are required, and it is very convenient to use. ❄ Adjustable Fan Head: Adjustablebracketsallowfor a 45-degreemovementofthehead. You can control the direction of airflow according to your need. ❄ Safe Practical: Great cooling fans 12V safe voltage, with high-security standards, and ensure the safety of the fan. It meets the daily use of fish tanks. ❄ Multiple Types optional: There 1 to 6 heads fans for you to choose in accordance with your demands. ❄After-sales Service Guarantee: Any problem, please contact our store without hesitation. Honor to serve you!