Review on Optimized for SEO: Waterproof IP67 High Airflow 140mm (140x140x25) Fan by Coolerguys by Daryl Fitch

was a bit confused figuring out which wire is positive and which wire is negative because it uses a connector I don't have a pair with. Then during the test, this knuckle hit the spinning blade with his knuckles and broke it! Luckily another device I bought at the same time solved my problem so I didn't have to order this one again. I was lucky and hit the blade at the right angle to break it without getting hurt - it could have been a lot worse.