Case fans help protect your whole computer investment by providing case cooling to reduce component-killing heat buildup, thus increasing the longevity of components. Smart Fan with built-in temperature sensor helps keep your system quiet. When your system's heat increases, Smart Fan speeds up to cool it down. Smart Fan decreases noise when your system is cool, and adjusts its speed as you use more of your system resources.PRODUCT FEATURES: Built-in temperature sensor; Variable speed: RPM increases as the temperature rises; Double ball bearing design for extended life; Comes with a 4-pin power connector and a separate signal connector to motherboard.