WINSINN 40mm RGB Fan 5V USB Color LED Hydraulic Bearing Brushless 4010 40x10mm - High Speed (Pack of 4Pcs) Hydraulic Bearing Brushless 4010 40x10mm - High Speed (Pack of 4Pcs)

All but one didn't work, or the wires snapped off the connection with the slightest movement. The quality is just too poor to recommend.

Le consiglio, molto silenziose e molto potenti.Ottimo rapporto qualità prezzo.

I'm building a wearable PC using a super tiny NUC and before I improved my power efficiency I was going to use these to cool the battery, but now I'm just cooling the NUC which mostly relied on passive cooling - not anymore! It used to get incredibly warm, but with these glowing wonders it's as cool as the room I walk around in.I have to get my ear within a few inches of them to hear them at all, and they definitely blow air. One of the cables was slightly loose out of the box but I cleaned it up. They're not the best quality, but you're getting RGB fans at a unique size.I think the only real downsides are the USB cable length is a bit longer than I think is necessary, and the fact that the rotating colors can't be controlled in any way at all as they are not addressable or anything, they just constantly change. Still, totally worth it if this is what you're looking for at a tiny size.

Three failed within a month. Actually all four did.Received a replacement set of 4 fans. One of the replacement fans failed on startup.Horrid product.

Not sure why warmth and thickness are included in the review... good little fans just don't use in a wet environment they won't last more then a day.