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, Fan Speed Range 1500 to 3500rpm max, Input Voltage 12V 0.18-0.35 Amp, Air Flow Rate 25 to 35CFM. 30dB Noise Level. 4 Watt Power Consumption, Extended Cable length 12inch Having Four Wires With 4pin Motherboard connector, to achieve PWM smart fan functionality your motherboard should have 4pin Sys Fan Header. Size 80mm X 80mm X 25mm Thick, 100% Suitable for Intex,Zebronics,i-Ball & all Other Assembled Computer Chassis, Very Easy in Fitment. Included With Mounting Screw, durable material. 1 Year brand warranty