Summary A fan is a good idea/product to ventilate a tent or computer at work. However, there are serious design flaws that require attention. A USB rechargeable battery and a USB extension cable are required for tent use. Computer hardware reviewer with over 30 years of experience. Benefits1. Good for 140mm fan.2. Good idea.3. Good fan control. Disadvantages1. Short cable - 19 inches. You need a USB extension cable. 2. The connection of the cable to the fan frame must be strengthened - it will break. 3. There is no description of the ball bearing design used (sleeve, ball, fluid). So durability is questionable. .four. A little noisy. I have a large collection of computer fans to compare, mind you. 5. Poor quality control. 2 out of 8 magnets came loose on first use. 6. Poor design of magnetic frames. Separate the two magnetic frames. There should be metal protrusions to help. 7. Fan upgrade required. The fan should have a deeper design instead of the standard 25mm depth to improve airflow. 8. Power Consumption. This fan draws 5V at 0.55A. Make sure your USB port can supply enough juice.
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