You can use this USB Fan easily and it is powered by USB port. No external power needed， just plug straight into your USB port to feel the breeze. Powerful but quiet operation. Low power consumption， also suitable for outdoor using.                                    Features            Dimensions:Heat sink: 3.03" x 2.68" x 1.57" (L x W x H)12VDC Fan: 2.76" x 2.76" x 0.6"Bearing: Sleeve bearingRated speed: 4200 RPM + / - 10%Rated power: 3.6WNoise level: 31.8 dBAAir flow: 33.80 CFM at 4200 RPMCurrent: 0.3AConnector: 3 Pin， MainboardLife hours: 30000 hoursApplication: AMDAthlon 64 X2 (Dual Core)~ 4400+ (K8)Athlon 64 ~ 4000+ (K8)Athlon 64 FX-53 (K8)Opteron ~ 850 (K8)Sempron ~ 3300+ (K8)                                                                                                Package Includes            1 x AMD CPU Athlon 64 Heatsink Fan Socket 754 939 940 K94