To improve the situation of damp and mildewed clothes, the disposable moisture-proof products are often used, which is harmful to the environment. Osuszacz, a dehumidifier contains a water-filled magnesium battery, uses water as a medium to generate electricity. First, only a small amount of water needs to be added to dehumidify, and the water collected therefrom is replenished to the battery for a circulation. Osuszacz with the smart devices can remind users to use excess water for watering or cleaning, and adjust the intensity of dehumidification according to the humidity.