The REACTOR Gen 2 Red Laser and Holster is a red laser sighting system that mounts to the trigger guard for a low profile and smooth draw. It uses a 635-650 nm red laser with two modes: constant and strobe, and up to 12 hours battery life in the Gen 2 model. The ambidextrous IWB holster features INSTANT-ON activation. Note: Does not fit Springfield XD subcompact or M&P Shield EZ. Compatibility includes Glock Gen 3-5 (ambidextrous IWB holster included), Glock 42, Glock 43/43x, Kahr .45 ACP polymer frames, Kahr 9MM & .40 polymer frames, Remington RM380, Ruger LCP II, Sig Sauer P238/P938, P365, Smith & Wesson M&P Shield 9/40, Shield 45 ACP, Springfield XDe, XDs/XDs Mod 2, Taurus Spectrum, and more.