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Adjustable voltage power controller, DC 3V-12V 2A, just adjust the required voltage through the switch knob. Universal DC adapter, voltage input range 12V suitable for different countries and regions of power supply demand. Advanced design, securely protects your devices from over voltage, over current, short circuit and over temperature. The variable-speed controller enables you to set your DC fan’s speed to optimal noise and airflow levels for various applications. Female DC Connector 5.5x2.1mm 12V 12CM 120MM 120X120X32MM 12032 Brushless Centrifugal Blower Cooling Fan Reducing equipment working environment temperature,prolong the service life of equipment