Control 4 Fans Simultaneously; 4 channels stepless fan speed control, specially designed for PC enthusiasts.; Cool Appearance with Blue LED; With blue LED surround each knob to make your computer case with side window more awesome.; Reduce Noise; Reduce noise and maintain proper heat levels to keep all the parts of your computer running with high performance.; 3.5" Drive Bay Compatibility; Designed to fit in a computer case with a 3.5" drive bay, easier to install.; Manual Control; Manually adjust from full speed to low speed, the slower the fan, the quieter it will be.