The double turbo blades and brushless double motor - quieter and maximum ventilation The front 3 blades, the rear 5 blades rotate in opposite directions and are driven by different motors to generate strong drafts with a lower noise level. Decibels are between 30 and 40. Touch control - Simple and convenient operation With a smart touch chip, you only need to lightly touch the top of the fan to turn the fan on and off and set the speed. 2-stage adjustable wind speed - to meet diverse needs the 1st stage offers you comfortable without much noise wind speed, suitable for use at work or while sleeping; the 2nd level offers you a cool and strong draft so that you can enjoy a pleasant coolness in summer. Practical fan - Compatible with many USB ports 1m USB cable, compatible with 5V USB output device, e.g. mobile phone adapter, USB charger, laptop, power bank, etc. Multi-angle adjustment - 0 to 135 degree adjustment Thanks to the high-quality and elegant aluminum handles, you can adjust the fan angle from 0 to 135 degrees. Product s mini usb fan usb mini fan Specification: Color: Black Size: 112 * 117 * 100mm USB cable length: 1M Voltage: DC 5V Power: 2W Speed: 5500 RPM Wind speed: 2 levels 2 speed adjustment Level 1 gentle, comfortable and won't mess up your hair and documents. It is suitable for personal use on the desk. Decibel: 30-40DB, suitable for daily office use, wind range: 50-80cm Cool level 2, strong wind that helps you get away from the heat. Suitable for outdoor use in hot conditions. Decibel: 50-60 dB, suitable for use in a large room or in a noisy environment; Note: As the turbine speed increases, the draft will increase. And the sound of the draft will increase too. This sound is normal natural wind. You can put a book or cloth on the underside of the fan to reduce the noise caused by vibration. And bring you more comfortable experience; If you expect this fan to be able to give you a much quiet or ultra-quiet effect, then this fan is not for you. Since the fan cuts off the air when it rotates around, and it brings with it noise, so that each fan makes a certain sound during operation. And this type of fan all over the market has the same sound.