This product is suitable for small confined spaces such as wardrobe, cabinet, bookcase, clothes organizer, electrical products case, safe, RV, car, inside piano, bedroom, kitchen, bathroom and so on. It is born to prevent goods to be damaged by damp, mold, mildew and excess moisture. Features: Made of high hygroscopic material SiO2, hygroscopic crystal included can be repeatedly used and environment-friendly. Wide range of moisture absorption hole can dehumidify the moisture effectively. LED indicating light: dark green light indicates the desiccant crystals are full of moisture, orange means the moisture has been released completely. When the light turns green, it's rechargeable for 8-12 hours then it will turn to orange. It won't disturb others without noise. Small and portable size is suitable for closet, cabinet, bookcase, home and office.