... rotation,ultra-quiet 4.excellent workmanship office desk portable new USB micro fan with excellent quality Power source plug: USBMaterial: ABS& ... new DC brushless motor, strong wind, super quiet.2.5V USB(cable length:1.2m) power supply, plastic shell, special mesh ... wind, cool and refreshing, comfortable. 11.USB plug and play,no external power needed,USB power adapter required for the 5V .. 1000MA ...