Material: plastic and electrical components Color: green and black, The driver board can drive hard drive brushless motors, CD-ROM brushless motor and so on, micro 3-wire or 4-wire brushless hall motor, It have reverse voltage protection, over-current protection, phase inversion control Driver voltage: DC5-12v Working voltage: le; 1.2A Speed Adjustment: 0%-100% Note: the brushless motor line receiving the terminal drive board must be pressed firmly, weak will be the lack of phase operation and burn the chip. Board terminals fixed slack screw, use a thicker line connected to the board. How to identify the four-line public port of the 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 it's a COM terminal Size: 6*4.5cm/2.36"*1.77" Quantity: 1Pc Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 1Pc x 5V-12V DC Brushless Driver Motor Driver Board