If you have any questions, please feel free to contact us and we will reply within 24 hours. Product Description: Small but powerful: Compared to older versions of USB metal fans, this fan can be punched for quick cooling.Do not look down due to its small appearance.You'll be amazed at the strength of the air flow. Silent operation: Although the fan is very sturdy, the noise is less than 50dB even at high speed.When working and sleeping, this is a quiet good friend.Very suitable for your desk, office bedroom use. USB powered: Powered by a 5-inch USB cable, compatible with computers, laptops, portable power, wall chargers and any other USB-enabled power supply.USB fan energy saving and environmental protection. Adjustable & easy to clean: The fan head can be tilted from 0 to 40 degrees to direct airflow to the desired location.The removable front cover is easy to remove for easy cleaning of the fan blade. A lifesaver for hot summer days: avoid hot flushes.This summer will be even happier Mini USB fan with updated airflow Want a small USB fan with strong airflow?Need a quiet fan on your desk?Don't hesitate to opt for the OPOLAR 4-inch fan at an affordable price. Features: USB power supply Three kinds of set Silent running To ensure that we meet your needs,OPOLAR offers a one-year warranty for defective products.Improper manual operation, including but not limited to disassembly, burning, soaking and dropping. Specifications: Output power (Max):2.5W Material :ABS plastic Dimensions (in inches):6.6 x 3.3 x 4.9 inches N.W. (pounds): about 0.33