Can be placed in closets, coat or sweater inside to prevent mildew, etc. widely used in instruments, leather, shoes, clothing, food, medicines and household appliances. new and high quality. Can be used to protect the camera, lens, Miniscopes, 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.