Theoretically allows ventilation so cool air circulation by a device placed on it (protable computer, Internet Box, etc ...) In fact, the three tiny fans hardly blow air and end up being noisy in use. In a quiet room, that means a roar gene when watching a movie and the sound is low. Moreover, if the feet of the device which is placed above fall in the wrong place, they obstruct the little air fans. In short, gadget which illuminates in blue but no effective cooling. To avoid even a small price because is useless.