ArmaLaser GTO/FLX Finger Touch Red Laser Sight for Smith and Wesson M&P 3.5 Black. ArmaLaser designed these Red Laser Sights with 2 options for activation: the FLX switch for intuitive instant activation and the switch on the GTO that you can access with your index finger. The master on/off switch on the ArmaLaser GTO/FLX Red Laser Sight lets you turn it off to use BUIS or other optics. Customize your S&W pistol with the ArmaLaser GTO/FLX Finger Touch Polymer Red Laser Sight. Specifications for ArmaLaser GTO/FLX Finger Touch Red Laser Sight for S&W Handguns: Manufacturer: ArmaLaser Color: Black Beam Color: Red Laser Output: 4 mW Wavelength: 635 nm Attachment Type: Weaver Picatinny Battery Type: 357 CR1/3N Battery Quantity: 2 Gun Make: Smith & Wesson Condition: New Mount Type: Weaver Features of ArmaLaser GTO/FLX Finger Touch Red Laser Sight for S&W Handguns: Grip-Touch Activation by using FLX Side-Touch Activation without FLX Ultra-bright 635nm red laser Steady and pulse beam options. Master on/off switch. Windage and elevation adjustable. Picatinny/Weaver rail mounted. Sensor located where trigger guard meets grip. 5 Year Warranty. Package Contents: ArmaLaser GTO/FLX Finger Touch Red Laser Sight for S&W Handguns What firearm models does the manufacturer say ArmaLaser GTO/FLX Finger Touch Red Laser Sight for S&W Handguns is compatible with? The manufacturer says that ArmaLaser GTO/FLX Finger Touch Red Laser Sight for S&W Handguns is compatible with Smith & Wesson M&P 3.5in Smith & Wesson M&P 4.1in Smith & Wesson M&P 4.25in Smith & Wesson M&P 4.5in Smith & Wesson M&P 4in Smith & Wesson M&P 5in Smith & Wesson M&P 22 Compact Smith & Wesson M&P 380 Shield EZArmaLaser GTOFLX04: GTO/FLX Finger Touch Red Laser Sight for Smith and Wesson M&P 3.5 Black