1、Made of good quality plastic, solid, durable and wear-resistant. Insulation material wiring to ensure safety. 2、Double fan head design, fan head is 100 degree rotatable, you can adjust to the optimum wind direction. 3、Reduces water temperature and drops 3-4 ℃. 4、Two speed switch for easy control of air volume. 5、Quiet design, which will not scare the fish in the tank. Features: 1. Made of good quality plastic, solid, durable and wear-resistant. Insulation material wiring to ensure safety. 2. Double fan head design, fan head is 100 degree rotatable, you can adjust to the optimum wind direction.  3. Reduces water temperature and drops 3-4 ℃. 4. Two speed switch for easy control of air volume. 5. Quiet design, which will not scare the fish in the tank. 6. Suitable for fish tank wall less than 1.2 cm. Easy installation and no assembly required. Specification: Material: Plastic Color: Black Voltage: 100-240V Power: 1.9W x 2 Adapter Output Voltage: 12V Optional Plug: US Plug, EU Plug Use: Fish tank cooling Fan Size: Approx. 9.5 cm/ 3.74 inch Clamp Size: Approx. 20.3x 6.5 cm/ 7.99x 2.56 inch Packing List: 1 x Fish Tank Fan 1 x Adapter 2 x Fixed Knob