What You GetKit includes 140mm x 25mm fans, 14cm fan grill, mounting screws & variable speed controller; offer 1-year Replacement Warranty [If any problems, please freely to contact us] Wide ApplicationPopular used in cooling or ventilation for cabinets, grow tents, incubators, laser enclosures, kegerators, and more. also can be used as a exhaust fan for basement, garage, HVAC, airbrush booth to circulate air; or as a replacement fan for various products Variable Speed ControllerYou can control the fans speed freely to optimal airflow and noise for various applications by adjusting the voltage through AC/DC adapter; as well as turn the fan on and off; Total Length: 7.5 ft Output: 4V to 12V DC 2A Input: 100 to 240V AC Plug and PlayEasily connect the speed controller into the fans terminals [5.5*2.1mm DC jack] and the plug into a wall outlet; Start Voltage: 5V Fan Specs140 x 140 x 25 mm ( 5.51 x 5.51 x 0.98 in. ) 12V 0