Crimson Trace LG-350 Lasergrips S&W J-Frame Round Butt Laser Sight - Red - The LG-350 Lasergrips laser sight is an enhanced laser sighting option for Smith & Wesson J-Frame (round butt) Revolvers offering excellent comfort for shooters. This model features a front laser activation button and boasts over 4 hours of battery life from (2) 2032 Lithium batteries. LG-350 Lasergrips feature the Crimson Trace ShockStop system, which couples soft, anti-vibration material and a cushioned grip to reduce recoil while increasing shooter comfort and accuracy. User-installed in moments by replacing factory grips, the unit is completely user-adjustable for windage and elevation. Beam Intensity: 5mW Peak, 633nm, Class 3R Red Laser Adjustable For Windage And Elevation Dot Size: Approximately 0.5in At 50ft Front Instinctive Activation Button Black Grip Replacement Installs In Minutes