The Evercool 35mm X 10mm 5 Volt Fan is designed for low noise operation and a 5 volt power source. The connector on this fan is a D type 2-pin connector used on some video cards, external enclosures, and circuit boards. 

Dimension: 35mm X 35mm X 10 mm
Speed: 8000 rpm
Air Flow: 4.5CFM
Noise Level: <21 dBA
Voltage: 5 V
Connector: 2-Pin D-Type
Bearing: Ball Bearing