The driver board can drive hard disk brushless motors ,CD-ROM brushless motor and so on , the Mini 3-wire or 4-wire without hall brushless motor ,it's have reverse voltage protection , Over current protection , Phase inversion controldriver voltage: DC5-12vworking voltage: less than equal 18Aspeed adjust :0%-100%note: Brushless motor line of receiving terminal drive plate must be pressed sturdiness, poor contact will lack of phase operation and burn out the chipBoard terminals fixed screw clearance, please use coarser line connected to the board.How to identify four line motor public port: use the of the multimeter * gears test this four terminal , One of the terminals and the other three terminal value of the minimum and equal ,so it's COM terminalMaterial: plasticColor: greenPackage Contents:1pcs 5V-12V 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.