Now I'm not sure if/how you could use this with a computer. But they will sit on the desk while you work with a PC. I bought mine at Walmart fot $14.....it is a smaller version of the one in the link. It works off AC with a small wall-wart which also charges the built-in ni-cad batteries. It also has a compartment for four "D" cells. This is a 6v system. The smart part....it automatically selects the least costly power method. AC first if available, then the re-chargables, finally the std D cells. What I really like about this small version.....you have a dial to select fan speeds. At the minimum, this fan is quiet. The larger 12V fan in the link, is only 2-speed. I've also seen them at Target stores. Believe it or not.....they come charged up (without the d cell batteries however).
Link
"Smart Power" fans from 02-Cool.
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I do have a version of the 12V fan in the link (no batteries) It blows a bunch of air, even at the low speed.....but it's noisy.
The little one I have has a fan about 120mm. It's quiet enough at the lowest setting. Turned to the highest setting, it blows more air than any 120mm computer fan I have. But it's too noisy at that setting. On the batteries, it turns slower and quieter.....
The little one I have has a fan about 120mm. It's quiet enough at the lowest setting. Turned to the highest setting, it blows more air than any 120mm computer fan I have. But it's too noisy at that setting. On the batteries, it turns slower and quieter.....