(1) Working voltage: DC12V(2) Control : 8 fans can be used at the same time, PWM fan speed control, 4-wire fan or 3-wire fan with PWM speed control port can be used in common. Note that the fan interface sequence is commonly used. The maximum of a single fan is within 60W, and the is within 300W (note that the depends on the supply of the chassis)(3) Quiescent current: 0.015A (standby state)(4) PWM duty cycle: 0%-100%(5) PWM frequency: 25khzNOTE:1. The Fan Speed Controller only suit for fans that with pwm speed regulation, and there must be a pwm speed regulation line. If you are not , you can the fan manufacturer.2. 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 will cause damage.3. The batches of raw materials are different, and the colors of the interfaces and capacitors on the product are random(the specified color cannot be ), which does not affect the use.size:60MMx35MMx16MMMaterial:PCB+Plastic+Metalcolour:greenPackage Contents:3 x Miner Fan Speed ControllerOnly 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.