Features: Experience precise fan speed control with our brushless motor technology, ensuring stable rotation for fans and hard drives under varying loads to solve compatibility issues with traditional controllers. Featuring wide compatibility for various opticals drives and hard drive fans, this adapter requires not extra converters and includes intelligent temperature control to prevent overheating during extended use. for 3D printing enthusiasts and professional working with high performances computers, this fan speed controller meets the needs of users seeking thermal management for their equipment. Perfect for home offices or quiet workspaces, the optimized circuitry significantly reduces operational noise while maintaining efficient cooling for 3D printers and computer systems. With toolless installation and PCB construction, this 3D printer fan controller simplifies upgrades for users of all skill levels, delivering quiet performances and extended device longevity. Specifications: Materials: circuit board Size:63x43mm Package Includes: 1PC 2-5S Brushless Motor Speed Control Fan Speed Regulator note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.