Stylish useful 2X Silica Gel Desiccant Moisture 4 Absorb Box Reusable widely used in precision instruments, leather, shoes, clothing, food, medicines and household appliances. Can be placed in closets, coat or sweater inside the box to prevent mildew, etc. Can be used to protect the camera, lens, microscopes, telescopes, audio and video equipment, records, tapes, video tapes and computer diskettes, etc., in order to prevent mildew. With moisture after the red color change from blue features. You can reuse your used silica gel with Microwave. Heat in microwave just 5 min. (Medium / low power), Color will slowly change back to blue after reactivation