Compatible with portables PCs or MacBooks with screen sizes up to 14 inches, the Notebook Cooler Basic is a slender perforated aluminum panel that measures 27 (H) x 270 (W) x 240 (D) mm and weights 300 grams, which provides passive cooling for those who like things both cool and quiet.
The Notebook Cooler Designer is 42(H) by 330 (W) by 280 (D) mm, can be used with up to 15-inch machines, and packs an USB-powered 110mm fan which works at 800 RPM (rotations per minute) and has a sound output of 23 dBA.
As for the Notebook Cooler Mini, this one is 25 (H) x 229 (W) x 121 (D) mm, it weights 200 grams, features support for laptops up to 17" and includes an 80mm (1200 RPM) fan with a low sound output of 18.8 dBA.
Source: TC Mag