Description: The driver board can drive hard disk brushless motors ,CD-ROM brushless motor and so on , the -3-wire or 4-wirewithout hall brushless motor ,It's have reverse voltage protection , Over current protection , Phase inversion controlDriver voltage : DC7-12vWorking voltage : 1.2ASpeed adjust :0%-100%Note : Brushless motor line of receiving terminal drive plate must be pressed sturdiness, poor contact will lack of phaseoperation and burn out the chip.Board terminals fixed screw clearance, please use coarser line connected to the board.How to identify four line motor public port: use the resistance of the multimeter x gears test this four terminal,One of theterminals and the other three terminal resistance value of the minimum and equalSo it's COM terminalSize:6 x 4.5cm/2.36 inch x 1.77 inchQuantity: 1PcColor: greenmaterial: plasticNote: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Contents: 1Pc x DC Brushless Motor Driver Board ControllerOnly the above package content, other products are not included.Note: Light 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.