The AC Infinity Multifan S4 140 mm Quiet USB Case Fan in black is a versatile and efficient cooling solution for computer cases. With a ball bearing design and a fan diameter of 140 mm, this case fan offers quiet operation and powerful airflow. The fan is powered by a 5V USB connection, making it easy to install and use with a variety of systems. Made from durable plastic, this fan is compatible with universal brands and is designed by AC Infinity, a trusted brand in cooling solutions.