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The lever in the dryer is similar to a seesaw.With the lever ,it will adjust the heat released by the dryer automatically.When the wet cloth is hung up on the lever ,the lever will go down because of the weight of water,making dryer release the heat at the same time.While if another side of lever is hung up by nothing or a drier cloth,it will stop or reduce the releasing of the heat.Besides,the dryer was surrounded by the plastic case.So it can save a lot of energy for the user.And the lever also has a function called "self-lock",which will prevent the cloth drop on the floor.