The viridian reactor r5-r gen 2 red laser sighting system is easy to install and blends seamlessly into the trigger guard for invisible profile and smooth draw.Viridian's red lasers utilize a 635-650nm laser wavelength to generate the brightest, sharpest red dot possible.The gen 2 models feature a instant-on ambidextrous, inside the waistband (iwb), custom fit holster with instant-on activation.Power Switch: Ambidextrous Push ButtonWavelength: 635-650nMRange: 25 yds Day/1 mi NightBattery: 1/3NLaser Color: RedFirearm Fit: S&W M&P ShieldAdjustments: Windage & ElevationFinish: BlackMount Type: Trigger Guard