Can be placed in closets, coat or sweater inside to prevent mildew, etc. 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. new and high quality. widely used in instruments, leather, shoes, clothing, food, medicines and household appliances. With moisture after the red color change from blue features.