This is an accessory Red Filter Adapter for the MF Tactical R5-350-1 and R5-350-5 flashlights (NOT compatible with the compact R5-350-1C+ or R5-350-3C+ models). This filter adapter easily replaces the standard clear lens and bezel assembly. Just unscrew standard bezel and screw on the Red Filter Adapter in its place. This lens is made of hardened mineral glass, which is resistant to scratching or breakage. It will also outlive and outperform similar products made of plastic.
A red filter protects your night vision. Under low-light or no-light conditions using white light can impair your night vision for up to a full hour. Using a red lens reduces this affect, allowing re-adjustment to full night vision in just a few minutes.