Features: 1.Aquarium Cooling Fan: Help to change the direction of air flow, adding oxygen to water. Cooling fans help dissipate excess heat from aquariums during spells of hot weather, allowing aquarium inhabitants to be kept within the correct temperate range. 2. Fish Tank Cooling Fan: Lower power consumption, little noise, large air output, quickly dissipate the heat of aquarium. These fans can be used on their own, or in conjunction with an automatic temperature controller. Easy installation on the glass fish tank. 3. Extendable Fan Head: You can connect more Fans (4 heads Max) with split cords to cool down your aquarium in different direction to get better effect. 4. Adjustable Power: With rotary switch you can adjust the power of the fan according to your need. 5. Application: This is a cooling fan for freshwater and saltwater aquariums. The wind is strong. It reduces the heat transfer from aquarium equipment. It is quieter and more flexible than ordinary fans. Specifications: Voltage: 100-240V/12V Wattage: 4.7W Material: Plastic Application:Fresh water and Salt water Caution: 1. We may send you a plug adapter((EU, US, AU, UK,etc) according to your country . If you need another type, please leave a message after ordering or contact us directly.