... .Ultra-thin design,dexterity,easy to carry 4'' USB Cooler Fan1.DC brushless motor 2.Voltage:DC 5V ... & ABS2. Voltage5V3. Packing100pcs/ctn4. Power/RevUSB5. CTN Size 74*33*31.5cm6. Power2.5w7. ColoroptionalFeature1.2300RPM speed,96mm blade ... brushless motor, strong wind, super quiet. 2.5V USB(cable length:1.2m) power supply,plug and play, ... 9.Sofe wind, cool and refreshing, comfortable. 4'' USB Cooler Fan