4'' USB Cooler Fan 1.DC brushless motor 2.Voltage:DC 5V 3. ... .5W 4.Ultra-thin design,dexterity,easy to carry 4'' USB Cooler Fan1.DC brushless motor 2.Voltage:DC 5V 3.Power ... , new DC brushless motor, strong wind, super quiet. 2.5V USB(cable length:1.2m) power supply,plug and play,plastic ... to place. 9.Sofe wind, cool and refreshing, comfortable. 4'' USB Cooler Fan