wathai big airflow 120mm fan 110v 240v ac power supply, speed controller 3v to 12v, for mining machine cabinet chassis server workstation cooling wathai package include: 2 pcs dual 120mm fans with speed controller <br> size:120x120x25mm(single fan) <br> rated voltage:12v <br>rated current: 0.5a <br>connecter: dc 5.5x2.1mm female <br> speed: 2500rpm <br> air flow:85cfmx2<br> noise:35dba <br>bearing type:ball bearing <br> life: 50000 hours <br> weight:435g/pcs or 15.34 oz