Review on Compact 4 Inch USB Desk Fan: Powerful Airflow, Quiet Operation - Perfect for Cooling Desktops at Office or Home by Dmitriy Kingsley

Lightweight USB powered fan. Level 1 is quite quiet, but the fan stops by itself after about 30 seconds, making level 1 unusable for me. At speeds 2 and 3 you will definitely hear some noise (similar to a PC fan), but that's to be expected as airflow increases significantly at these speeds. I can feel a gentle breeze even sitting two feet away. I don't know why level 1 doesn't stay on, but level 2 and 3 are great.