Great to quiet down the Fans in your Home Theater Cabinet! For use on 4-pin fans (like the big Deltas and Tornados) Now your fans with 4-pin Molex connectors dont have to be left out! * Built in thermal sensor. Controls fan speed based. Female 4 pin molex on one side and 4 pin male molex on the other. Pass-through connection. Supply Voltage: 11V - 13V. Output control: Pulsed width modulation @ 30Hz. Min Duty Cycle: 40% @ 70degF (21.1C). Max Duty Cycle: 100% @ 100degF (37.7C). Turn-on boost: 100% for 2 seconds. Can control multiple fans. LED light for verification *May not be compatible with all fans We trust in our products at Coolerguys and test everything that is sent out! We happily extend a three-year replacement warranty to all our Coolerguys branded products.