Key benefits Quiet, efficient cooling: Built-in temperature sensing automatically adjusts fan speed to match ambient conditions, lowering noise and reducing power use compared with fixed-speed fans. Precise, responsive control: 4-wire PWM output with up to 25 kHz frequency and smooth duty-cycle adjustment gives accurate speed changes with low interference and minimal jitter. Reliable, long-term operation: High-quality PCB and stable components, including an onboard NTC thermistor and a dedicated PWM output transistor, are designed for continuous use and secure fan connection. What this product does Controls 12V 4-wire PWM DC brushless fans using the standard CPU fan pinout. It monitors temperature and varies PWM duty cycle automatically so fans run only as fast as needed. Compatibility and hardware details Works with Intel and AMD standard CPU fans and other PWM-enabled models that use the 4-pin CPU fan header. Verified compatible with common small cooling fans such as 4010, 5015, and 6010 models. Hardware includes high-quality PCB, onboard NTC thermistor (temperature sensor), PWM output transistor, and a secure fan socket for reliable connections. Why customers need it Replace noisy, always-on fans with automatic temperature-based control to lower audible noise and energy consumption. Improve thermal management in compact or sensitive systems where precise fan response matters. Avoid jitter and electrical interference that can cause inconsistent fan performance or audible artifacts. Quick specifications Input: 12V Fan interface: 4-wire PWM, standard CPU fan pinout PWM output: up to 25 kHz Components: PCB with NTC thermistor, PWM output transistor, secure fan socket Supported fan types: 4-wire PWM DC brushless fans; Intel/AMD CPU fans; 4010/5015/6010 and other PWM-enabled models Practical use scenarios Small form-factor PC or HTPC: Maintain low noise during light tasks and increase airflow automatically under load without manual fan control. Network or media equipment: Add temperature-controlled fan operation to routers, switches, or media servers that require continuous, reliable cooling. Embedded or hobby electronics: Use with SBC enclosures, 3D printers, or custom cooling projects that use 12V 4-wire PWM fans for compact, efficient thermal control. Installation and operation notes Fits standard 4-pin CPU fan headers; no driver required for basic temperature-based automatic control. Designed for continuous operation; use in environments compatible with the fan and device thermal limits. Ensure the fan model supports 4-wire PWM control for full functionality. What sets it apart Combines automatic temperature sensing with high-frequency PWM output for smooth, low-noise fan control and consistent performance backed by durable components.