ArmaLaser Smith Wesson Smith Wesson Sigma SW9VE SW40VE TR15 Red Laser Sight with Grip Activation Extremely bright 635nm Red Laser with grip activation. Just grasp pistol normally to turn laser on. Custom designed fit for Smith and Wesson Sigma series. Will not fit newer SD9VE and SD40VE. 635nm red laser, considerably brighter than 650nm lasers. Class 3R 635nm &lt;5mW red laser. Adjustable laser, battery door, master kill switch. Made from DuPont Zytel polymer pistol material. Designed, assembled in Florida, USA. Patented. Ultra reliable electronics. Simple installation. Each TR unit can be adjusted to fire either a <span class="a-text-bold">steady beam</span> or a <span class="a-text-bold">pulsing beam</span> at your preference. <span class="a-text-bold">Included hex key</span> can be used to adjust laser for accuracy. Convenient<span class="a-text-bold"> battery door</span> means never having to re-adjust laser after a battery charge. <span class="a-text-bold">Master power switch</span> allows you to shut everything off for iron-sights practice and long-term storage.