Package Includes 

4 Pieces -  Small 20mm x 6mm fan 5v 

Rated Voltage: DC 5V
Bearing: Hydraulic Bearing
Fan Speed:12000RPM±10%
Noise Level: <23.7dBA±10%
Air Flow: 0.65CFM
Weight:7g
Lead wire: 15CM 
Connector: 2P-PH2.0