A third look at the structure of it. Now are mainly large panel style, look and feel better than before the thumb style. Thumb-style biggest problem is easy to get stuck, because the moment is relatively short, the magnitude of the switching operation is relatively small, spring light or a little bit tough, Microsoft, may cause the switch stuck. Two days ago to see Gray (Do not tell me it is rice country, which if rice country that I'm Martian) out of a so-called reset switch, try to feel the storm astringent, open look inside is a small wheel, press about a quarter turn, to reduce the inevitable friction, top painted oil. Just six months after the dry lubricant inside, this switch is how to use ah. 2, see the protection of the door, with a screwdriver or a small key poke two holes on one side and three holes in the bottom just a hole. With some effort, was stabbed into the protective door is unilateral, equal to none. This outlet was not enough security. 3, the copper material. If you see a bright yellow by the jack, then give it directly. Brass easily rust, texture soft, over time contacting conductivity will decrease. If the copper color is purple is better, copper relatively tough, not easily rust. Direct look is not enough, the general also open look. Many outlets are jack used here copper, brass inside are equally susceptible to rust. Even copper are used, there are hierarchical. Most brands of copper pieces are a good few stitching, rivets interface so that the interface will be fever, affect the conductivity. Technical Compare now into the brand will be used to do the whole piece of copper inside the copper pieces, so a lot of the conductivity increase.