The Sight-Line is a forward-facing laser that mounts to most pistols with a Picatinny or Weaver-style rail. The laser includes a unique mounting system, allowing you to position the large ON/OFF buttons so they are easy to reach. The laser has a wide adjustment range to line up with most calibers, ammo, and iron sight configurations, providing fast and precise aiming in low light. Whether used for practice at the range, home defense, or concealed carry, the TRUGLO Sight-Line laser is a powerful enhancement to your handgun in a compact and lightweight form factor. Features: Bright green laser marks point of impact on target Compact, lightweight design for comfortable concealed carry Constant or pulsing beam modes Single battery design for easy replacement without removing laser from the rail (CR1/3N battery included) Adjustable windage and elevation Fits Picatinny, Weaver, Glock, and many other pistol rails Adjustable recoil lug for versatile positioning Battery life: 8 hours continuous, 18 hours in pulse mode Operating temperature: -4AdegF - 149Adeg F (-20 to 65Adeg C) 1-year limited warranty