The HP ProOne 400 600 G6 All-in-One CPU Cooling Fan L89861-001 DFS240012A60T 12V is a black plastic CPU fan with a 4-pin power connection designed for HP computers and servers. This proprietary unit is specifically designed to fit a CPU cooler and provide efficient cooling for optimal performance. With a voltage of 12V, this fan is a reliable and essential component for maintaining the temperature of your computer's central processing unit.