The Crimson Trace LG-350G Lasergrips provide enhanced laser sighting for Smith & Wesson J-Frame (Round Butt) revolvers with a green laser and comfortable rubber wraparound design.LG-350G Green Lasergrips for S&W J-Frame revolversFront pressure activation button for instant laser engagementOver 2 hours of battery life from (4) 2016 Lithium batteriesUser-adjustable windage and elevation settingsFactory sighted at 50 feet with 0.5 inch diameter beamCrimson Trace ShockStop system reduces recoil and increases comfortEasy user installation - replaces factory grips in momentsPerfect for self-defense target shooting and law enforcement applications these laser grips combine enhanced accuracy with superior comfort and anti-vibration technology for improved shooting performance.