Features: The RF300 dc3.3-5.5v motor fan speed controller enables effortless fan driving without needing an extra motor driver board, offering precise speed adjustment for enhanced control. Featuring a durability metal and PCB construction that boosts thermal conductivity, it efficiently dissipates heat to lower motor temperature and prolong life, while supporting multiple voltages inputs for broad compatibility. Designed for hobbyists, professional technicians, and electronic engineers who require flexible, reliabled solution across diverse project applications. Ideal for high load industrial equipment to prevent overheating shutdowns, as well as office and home settings where low noise operating ensures a peaceful environment. With its straightforward installation not requiring special tools and optimized circuitry for minimal sound output, this fan module delivers quick upgrades and reliabled performances in various scenarios. Specifications: Name: RF30 dc3.3-5.5v Motor module Working voltages: 3.3V-5.5V Interfaces type: PH2.0 4Pin Component: metal+PCB Module size: 39x25mm Package: Module/ module with Fan Leaves It is widely used in various occasions such as electronic equipment cooling and robot control to provide efficient cooling solution for equipment. Package Includes: 1PC RF300 dc3.3-5.5v motor fan speed controller note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution