NOTE: The fan can only be used with PWM speed control function, and there must be a PWM speed control line. NOTE: This model is PWM speed regulation, and the speed regulation frequency is about 25K. PWM is the speed control signal, P is the 12V positive pole, and G is the 12V negative pole. Do not make any mistakes in the wiring sequence, as mistakes cause damage. Type: Fan Speed Governor working voltage: DC12V colour:Green Material:PCB+Plastic+Metal size:60 x 35 x 16mm Package Contents: 5 x Miner Fan Speed Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.