Red laser with constant beam. Custom designed to fit the Smith & Wesson M&P Shield 9mm pistol. Tactial design that matches the style and contours of the gun. Mounts to the frame without changing out parts or altering your weapon. Sits just under the bore for pinpoint accuracy. Ambidextrous activation for right and left-handed shooters. Distinct On/Off switch turns the laser on only when you need it User installs in minutes.