5V-12V DC Brushless Driver Board Controller For Hard Drive Motor 3/4 Wire is as shown in Pictures. The driver board can drive hard disk brushless motors, CD-ROM brushless motors and another micro brushless motor of line 3 or 4 wires without a hall sensor. It has reverse voltage protection, over current protection to ensure user safety. The driver voltage 5-12V, the higher the voltage the faster the speed, the maximum speed up to 10,000rpm. Specifications and Features: Drive voltage: DC 5-l2V Work current: ≤ 1.2A Dimensions mm (LxWxH): 64 x 46 x 16 Weight: 23g Type: Voltage Regulator Speed range: from 0% to 100% Phase inversion Control: Yes Voltage polarity protection: Yes Overcurrent Protection: Yes   Package Includes: 1 x 5V-12V DC Brushless Driver Board Controller For Hard Drive Motor 3/4 Wire