LG-350G Green Lasergrips(R) are 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 2 hours of battery life from (4) 2016 Lithium batteries. User-installed in moments by replacing factory grips, the unit is completely user-adjustable for windage and elevation. LG-350G Green Lasergrips feature the Crimson Trace ShockStop(TM) system, which couples soft, anti-vibration material and a cushioned grip to reduce recoil while increasing shooter comfort and accuracy.Features :Pressure activationGreen laserFactory sighted at 50Ft.5 inch diameter at 50 feet