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CenryKay DC 5V USB Fan Stepless Speed Controller Regulator Input to 2.5-8V and Speed Control Knob with Switch
►Turn the knob clockwise to increase the air volume. Turning it counterclockwise will make the air volume gentler and the knob has a switch function． ►Plug the governor male connector into the mobile phone charger, power bank or computer USB, and then insert the fan plug into the female connector. ►Input Power Supply Range DC 4V to 12V ( USB port). Output range DC 3V-8V (Not fit for 12V USB fan). ►Suitable for the speed regulation of DC motor, fan, fish tank oxygen pump and other products. ►Package including 4 pack usb fan step

Price is $15.00

Price: $14.99