Controlling the fans on the F4XT is done individually via the touch buttons on the front of the controller. The attached fans can be controlled in three steps: low / medium / high with the LEDs indicating which step is selected for each fan. The LEDs can be turned off. Also on the front of the panel are two USB (Universal Serial Bus) ports for your convenience. Features Controls up to four 4-pin molex fans Three adjustable speeds: Low / Medium / High LED off function Supports up to 12W per channel Two USB (Universal Serial Bus) ports Please note: The F4XT is only compatible with fans that draw power from a 4-pin molex connector. Standard 3-pin fans are not supported. To use standard 3-pin fans an adaptor from a 3-pin to 4-pin molex would be required (not supplied). Specifications Dimension 148.6 (W) x 42.5 (H) x 65 (D) Fan connectors Molex 4 pins Max. wattage per fan channel 12W Warranty 24 months