This High Speed PWM Fan runs according to the temperature, when CPU tells him that temperature is high it run fast otherwise it runs on normal speed Size 120mm x 120mm x 25mm 12V DC, Red wire as +ve Terminal and Black as -ve Terminal, Yellow as Speed Meter, Blue is speed controller Power Rating 12V 0.2-0.7Amp 8.5Watt Max, Designed to run 24X7 Fan Speed 800-3000RPM, Air Flow Rate 50-110CFM, Noise Level 22-35dB Build with 4Pin PWM Connector, Cable Length 300mm Included Mounting Screw, 1 Year brand warranty excluding physical & liquid damage, 60000Hrs Life.