DampRid Drop-In Moisture Absorbing Tab Starter Kit attracts and traps excess moisture that causes unpleasant stale musty odors. Without using electricity DampRid crystals absorb excess moisture to create and maintain optimal humidity levels wherever moisture is a problem in the home or office. To use simply insert an unwrapped tab into the top container. When the bottom container is full and the tab has dissolved pour out the water and insert a refill tab (sold separately). Each tab lasts 60 days depending on temperature and humidity and will begin working as soon as it is unwrapped! DampRid is ideal for use in the basement closet bathroom laundry room or storage area anywhere damp air is a problem. Not for use in moving vehicles. Keep out of reach of children. Read and follow all label directions.