1. Can bring 8 fans at the same time, PWM fan speed regulation 2. 4-wire fans or 3-wire fans with PWM speed control ports can be used in common use. Note that the fan interface sequence is commonly used. 3. The maximum of a single fan is within 60W, and the is within 300W (note that the also depends on the of the chassis supply) 4. Multifunctional compatible to control multiple fans 5. The product is convenient and easy to operate Working voltage: DC12V Quiescent current: 0.015A (standby state) PWM duty cycle: 0%-100% PWM frequency: 25khz Different batches of raw materials, the color of the interface and capacitor on the product are random, do not accept the designation, do not affect the use size:60x35x16mm Material:PCB+Plastic+Metal colour:green Package Contents: 2 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.