See "Tiny Cooling Fan" random file every fan of random file includes instructions, product certification, electrical wiring diagrams and packing slips, the packing list when buying inventory, check the quantity and quality components.
Second look "Tiny Cooling Fan" fan grille and there is an obvious distortion in the assembled fans cast net, a fan with a pen pointing to the highest point, slowly moving blades, blade several other corresponding distance from the tip of the point should be very close, and then turn the blades, to observe the rotation is light and flexible, and can be stopped at any position.
Three Views "Tiny Cooling Fan" control mechanism is flexible control mechanism includes a speed control switch, timer knobs, toggle switch, light switch, etc. These control mechanism should be flexible operation, reliable contact. To speed block, two block at the same time are not allowed to turn on or does not go a block by the phenomenon. Press the stop button, each speed gear keys should be reset.