Fangrui Product Details . Widely Used In Precision Inst Ents, 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, 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. 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 Shooting 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.