new and high quality. widely used in precision instruments, leather, shoes, clothing, food, medicines and household appliances. Can be placed in closets, coat or sweater inside to prevent , 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 . With moisture after the red color change from blue features. You can reuse your used silica gel with Miniwave. Heat in Miniwave just 5 min. (Medium / low power), Color will slowly change back to blue after reactivation. Size: 5.5cm x 6cm x 2.2cm. Package Included: 2 x Silica Gel Desiccant Moisture Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.