Specifically designed for the unique contours of 4th Gen GLOCK Subcompact pistols the rear activation LG-852 offers a repeatable sighting advantage for your pistol. These Lasergrips provide the versatility of instant activation from a rear switch. – Platform Lasergrips® – Material Polymer – Attachment Grip Attachment – Activation Location Rear Activation – Sighting Factory Sighted at 50′ – Master On/Off Switch Yes – Free Batteries For Life Yes – Battery Type Two #2025 Batteries – Laser Battery Life Over Four Hours – Wrench Size 0.05 – User Adjustable Windage and Elevation – Finish Polymer Grip with Rubber Overmold Activation Pad – Installation User Installed – Warranty Three Year Full Warranty – Color Black – Dot Size Approx. 0.50 at 50′