Crimson Trace Green Laserguard for Glock 42 & 43 with Pocket Holster -  LG-443G-H The human eye processes the color green more effectively than any other color, and Crimson Trace offers the brightest green laser allowed by law, (5mW peak, 515nm, Class 3R) Laser Sight and Pocket Holster Bundle for GLOCK 42 & 43 Activation Location: Front Activation, Attachment: Trigger Guard Battery Type: One 1/3N Lithium or Two 357 Silver Oxide Batteries (Included) Activation Mode: Pressure Activated