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NOYITO 5V USB Fan Stepless Speed Controller Regulator with Switch Speed Module DC 4-12V to 2.5-8V 5W (Pack of 2)Note: When used to adjust the fan in two stages, please put the fan in one gear, otherwise it may not be able to adjust the speed! Description The stepless speed regulator output voltage range smoothly changes between 3V-8V, so the fan..