Drop these inserts into the sides of the camera housing to prevent fogging in cold & humid environments. To Reuse: Inserts will last for Approx. 4 uses. To dry out & reuse, heat inserts on a pan in oven at 300°F (Gas Mark 2 or 150o C) for 5 minutes. Store in an airtight bag. Compatible with ALL HD HERO Original + HD HERO2 Professional Cameras. NOT COMPATIBLE WITH HD HERO3. Whats Included 3 Sets of Anti-Fog Inserts