The driver board can drive brushless motors ,CD-ROM brushless motor and so on , the -3-wire or 4-wire without hall brushless motor , It's have reverse voltage protection , Over current protection , Phase control Driver voltage : DC7-12v Working voltage : 1.2A Speed adjust :0%-100% Note : Brushless motor line of receiving terminal drive plate must be pressed sturdiness, poor contact will of phase operation and burn out the chip.Board terminals fixed screw clearance, use coarser line connected to the board. How to identify four line motor public port: use the resistance of the multimeter x gears this four terminal,One of the terminals and the other three terminal resistance value of the minimum and So it's terminal Size:6 x 4.5cm/2.36 inch x 1.77 inch : 1Pc Color: green material: plastic Note: Due to the difference between different monitors, the picture may not the actual color of the item. Package Contents: 1Pc x DC Brushless Motor Driver Board Controller Only 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.