The LG-389 LaserGrips bring a laser sight with instinctive activation to the reliable line of Ruger centerfire pistols made in response to direct solicitation from the U.S. Government. – Platform Lasergrips® – Material Polymer and Rubber Combination – Attachment Grip Replacement – Activation Location Dual Side Activation – Sighting Factory Sighted at 50′ – Master On/Off Switch Yes – Battery Type Two #2032 Batteries – Laser Battery Life Over Four Hours – Laser Output 5mW Red Laser – Activation Mode Pressure Activated – Laser Visibility Approx .5 Inch Diameter at 50 Feet – Wrench Size 0.028 – User Adjustable Windage and Elevation – Finish Rubber Overmold Grip – Installation User Installed – Warranty Three Year Full Warranty – Color Black – Dot Size Approx. 0.50 at 50′