Install in an unused expansion slot, and plug your fans into the Fan Alarm System. If one of the fans you have working hard to cool your rig fails, the Fan Alarm System will let you know about it right away, before meltdown strikes! Keep a cool head and cool computer with the Just Cooler Fan Alarm System! Supports four (4) cooling fans for Hard Drive, CPU, case exhaust, etc. Two (2) 3-pin fan headers. Two (2) 4-pin power connectors. LED indicators tell you which fan is malfunctioning. Built-in speaker. Alarm reset switch. Includes: This fan alarm looks for open circuit breaks with the fan and DOES NOT monitor fan RPM speed. 18,000 available. ME867