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Ordinary wall-socket will encounter certain problem after its frequent operation, that's, the plug is not firmly fixed in the socket as before. the main reason is that inside socket the shrapnel gets loose or aging. Especially in the use of household appliances, due to the loose plug, the household appliances can not work properly.The unique push-pull fixed design for plug can easily solve this issue. It is the right path to push the plug fixed screens into the fixed slots as you press the push-pull button.This design is able to overcome the deficiencies from loose sockets shrapnel.