I bought from them directly. Their fans are made to clip on a tent pole. And it does work well. I needed 4 more so I went to the only alternative I can find which is the secret Jardin pole fan. At least its available on Amazon unlike vivosun. And it looks like they are both only under warranty for 30 days so probably no recourse. The secret jardines cost a bit more at 40 per fan versus vivosun at 35 but the tent pole clip is pretty awesome. And the bad fan works, just no oscillation. Thanks for posting