Features: 1. Two speeds：There are two wind speed adjustable, which can drop the water temperature of the fish tank by 2 to 4°C to meet different weather and indoor temperatures, to ensure a healthy and comfortable life for fish. 2. Small & silent: The fan is miniature and exquisite, beautiful in appearance, small in use space, and will not affect the ornamental of the fish tank. At the same time, the fan motor adopts an anti-noise design due to the updated technology, and the noise is reduced by 30% compared with other similar fans, does not make the fish tank vibrate, make you quietly enjoying the process of cooling the fish tank. 3. Safety & energy saving: Use DC5V/DC12V safety voltage, which make it safer to use. follow high safety standards to ensure the safety of the fan, and use safe insulating materials for wiring to prevent hidden dangers. Compared with other fans, this fan also saves 30% energy. 4. Suitable for a variety of fish tanks: With clamping mouth, which can be adjusted. Suitable for fish tanks with a thickness of 3-8mm, and fit on a tank with a rim. Basically meets the daily use of all fish tanks. The fan is suspended on the water, and the curved part of the fan enters the fish tank about 1 inch, and the part of the fan will not touch the water surface. 5. Great value for money: There 4 models for your options,you can selete the correct one according to your situation. Specifications: Voltage: 110-240V Wattage: 2.2W / 3.5W 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.