Upgrade your next hunting experience with the AOF-18 filters for your HT18 series flashlights (compatible with HT18, HT18R , and HT18R V2 ). This set contains a filter for every need: Use the red light filter to preserve your night vision Blue light makes blood trails stand out for more efficient tracking The green light filter keeps you hidden since green light is invisible to many game animals See better through foggy conditions with the yellow filter All four filters fit snuggly in the included storage bag and can be easily carried on your belt or via the hanging loop.