3.5 inch standard floppy drive port design, easy installation quick, safe and beautiful Rotary manually adjust the fan speed, blue LED display working status 4 groups of fans can be connected simultaneously and separately for speed For high speed fan, designed specifically for PC enthusiasts Powered directly by the computer power Minimum input start voltage 5V Multi fan speed control function 4 blue LED lights 3.5 inch installation quick and easy For desktop fan speed adjustment Feature: Regulated max power output: