Olight FM10 Red Filter for S10 S10R S20 S20R S15 S15R ST25 M10 M18 LED Flashlights (Red) Made of rugged TPU, these filters slip over the head of the flashlight Fits Olight S10 S10R S15 S15R S20 ST25 M10 M18 M18 Striker LED Flashlights Available in Red or Green Color Red Filter preserves night vision and reduces the probability of alert animals Green filter enhances visual acuity while still reduces the probability of alert animals