Features: Increase speed to reduce computer part temperature when computer parts are busy. Reduce speed to reduce noise & power consumption when computer parts are free. Supports computer parts with cooling fan, like CPU, HDD, DDR, VGA, etc. Power by Molex 4pin female Support 1~8 channels fan speed adjust simultaneously, Supports fan speed revolution from shot donw to 100% full speed Adjustable knob available to adjust cooling fan revolution speed. Specification Voltage adjustable from 0V to 12V to control fan speed, Fan Speed controller by knob from 0% to 100% speed Fans can be shut down With Self-Stick for PC case internal installation