Material: plastic and electrical components Color: green and black, Driver board can drive hard drive brushless motors, CD-ROM brushless motor and so on, micro 3-wire or 4-wire hallless brushless motor,It have reverse voltage protection, over-current protection, phase inversion controlDriver voltage: DC5-12v Working voltage: le; 1.2a Speed regulation: 0%-Note: the brushless motor line receiving the terminal drive board must be pressed firmly, weak will cause no phase work and chip burnout. Clamps on the plate fixed screw, use a thicker line connected to the board. How to identify the public port of a four-line motor: use the resistance of the multimeter * gears test the four terminals, one of the terminals and the other three minimum and equal terminal resistance values So this terminal COM Measurement: 6*4.5cm/2.36"*1.77"Quantity: 1PcNote: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!