This is an accessory for Fenix flashlights which own outstanding filtration ability to maintain strong red, blue, or green light, and it could be used as signal lamp or weft when necessary. Features- Blue: -Preserves night vision -Perfect for highlighting blood trails -Uses a toughened ultra-clear glass lens with anti-reflective coating that provides heat resistanceand maximum light penetrability -Anti-roll design, easy to attach, easy to remove -Made from PC-2805 plastic created by Bayer Material Science AG This bundle includes EdisonBright BBX3 Battery Case for UC40, PD35, PD12, UC35