Always be prepared and have your target acquired quicker when you draw your Smith & Wesson M&P Shield Pistol with the Viridian Reactor 5 Gen 2 Red Laser Sight. This sight is easy to install and blends seamlessly into the trigger guard. The red laser has a 635-650nm wavelength to generate the brightest, sharpest red dog possible allowing you to effectively target up to 25 yards during the day and 1 miles at night. This site also comes with the ECR Instant-on ambidextrous inside-the-waistband holster that automatically activates the laser when your M&P Shield is drawn from the holster. No buttons, no squeezing, no doubt. When you draw, it's on.