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Size: 10 x 10 X 10 cm Double-motor and double blades design, and ultra-quiet. cooler usb fan Low-noise: motors work very quietly, and the noise is produced from the blow below 34dB as quiet as in a library environment Adjustable blow strength: a knob switch is designed for adjusting blow strength at two levels(0-stop, 1-weak, 2-strong) It is powered by the included USB cable to be connected with PC laptop Notebook power bank and USB power adapter, to provide strong and quiet wind to let you say goodbye to summer heat waves. Learn More