LG-350 LasergripsA(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 4 hours of battery life from (2) 2032 Lithium batteries. User-installed in moments by replacing factory grips, the unit is completely user-adjustable for windage and elevation.