The ArmaLaser TR15 Touch-Reflex Laser Sight for S&W Sigma TR15 has been designed to be the ideal laser sight for any shooter. This Laser Sight from ArmaLaser will throw out the most powerful laser beam the law will allow as soon as you grasp your pistol, accurately and immediately. Using human touch, True Touch Technology, you'll have a normal, natural feel without an awkward push button on the grip. Since it takes touch to turn on, the ArmaLaser TR15 Laser Sight doesn't have a mechanical switch to accidentally be depressed through holster, clothing or pocket material. Finally, the ArmaLaser TR15 Laser Weapon Sight a convenient battery door, ability to choose either a pulsing or steady beam, extremely bright 635nm laser, up to 5 hours run time - 2 years active time on a single battery, and master kill switch to allow practice without the laser all add up to make the TR15 not only the best but also the best value laser system available today.