Features Simultaneous Speed Adjustment: USB fan governor can adjust 24 fans at the same time through a single knob, with high speed adjustment efficiency. Multi Purpose: USB fan speed controller can be used for fan speed adjustment, aerair volume adjustment, ventilation and heat dissipation assistance, etc. Frequency Modulation Range: The speed control mode is 0‑100%PWM, and the frequency is adjustable from 2K‑50KHZ. Practical Indicator Light: Mini USB fan controller has a power indicator light and a working indicator light, which is more convenient to observe when using. Easy to Use: Fan governor module is easy to use, simple to install, no complicated procedures, installation can be used. Specification: Item Type: USB Fan Governor Material: Plastic Model: FC-D012-P007 Power Input Interface: Mini USB Power Supply Current: 2A Power Supply Voltage: 5V Fan Wiring Port: 4pin 2.0mm Pin Interface Installation Fixing Hole Diameter: 3.2mm x 4 Holes Package List: 1 x USB Fan Governor Package List 1 x USB Fan Governor