NiteCore NFR40 40mm Red Lens Filter/Diffuser For EC4S, EC4GT, EA41, EA42 Flashlights

This is the official NiteCore NFR40 red lens filter, designed to fit a bunch of their popular 40mm head flashlights like the EC4S, EC4GTS, EA41, EA42, and EC4GT.

It's a solid red lens that screws on or pops over the bezel.

Why red?

It helps preserve your night vision when you're out camping, hunting, or doing astronomy work, and it's less startling for animals.

It also works as a diffuser to soften the beam.

Made in China, brand new in its packaging.

A simple, must-have accessory for any NiteCore user who spends time in the dark.