The MUVI Anti Mist Tabs are designed to stop your MUVI HD or K-Series handsfree camera from developing mist whilst in the waterproof case in cold or humid conditions To prevent misting when using the waterproof case place two Anti-Mist tabs down the sides of the waterproof case prior to use, ensuring that they do not interfere with the rubber seal on the housing. The tabs will soak up any moisture and stop the lens from misting. To reuse dry the tabs in an over at 150 C/300 F for 5 minutes. Each Insert can be reused 4-5 times.