1PC New 5V-12V DC Brushless Controller Board for Hard Drive Motor 3/4 WireMaterial: Plastic and Electrical ComponentsColor: 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 controlDriver voltage: DC5-12v Working Voltage: le; 1.2a Speed regulation: 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 a motor: use the resistance of the multimeter * gears test the four terminals, one of the terminals and the other three values of the resistance of the minimum and equal terminalsSo 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. Package including:1Pc x 5V-12V DC Brushless Controller Motor Control Board