4-wire fan PWM speed controller, only supports 12V standard PWM fan (four-wire fan) speed control. Optimal Cooling Performance: your computer components stay cool and perform at their best with this high power PC fan controller. It features PWM speed regulation, allowing precise control over fan speeds to maintain optimal temperatures. Universal Compatibility: Designed to work seamlessly with NAS servers and PC setups, this fan speed controller connects easily via a connector, ensuring a hassle-free installation and compatibility with most systems. Enhanced System Efficiency: By efficiently managing your system's fan speeds, this controller helps in reducing overall power consumption, potentially lowering your energy bills while extending the lifespan of your components. Speed control is achieved through a dedicated PWM signal chip. The output interface is a standard 4-pin fan socket x4. Speed (duty cycle) adjustment range: 1-100% Color: Black Material: plastic Package Contents: 1* Fan Governor Only the above package content, other products are not included. Note: Light reflection 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.