ArmaLaser Smith Wesson M P 3.5 GTO Red Laser/FLX04 Grip Switch Extremely bright 635nm Red Laser with grip activation. Just grasp pistol normally to turn laser on. Custom fit FLX04 ultra thin remote touch sensor switch for Smith and Wesson M and P 3.5 inch included. Uses human touch technology to turn on, no mechanical switch or push button or holster activation. 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. Grip-Touch Activation by using FLX Side-Touch Activation without FLX Ultra-bright 635nm red laser Fits onto almost any Picatinny Rail Matte black, blends into pistol finish Virtually undetectable from the side 3M backing, very aggressive &amp; conforming with no harm to pistol finish Gold plated touch sensor Chemical resistant No reaching for a switch No awkward button on the grip FLX allows GTO to turn on instantly