ArmaLaser GTO/FLX Finger Touch Green Laser Sight for HK45C Black. ArmaLaser designed these Green 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 H&K pistol with the ArmaLaser GTO/FLX Finger Touch Polymer Green Laser Sight. Specifications for ArmaLaser GTO/FLX Finger Touch Green Laser Sight for H&K Handguns: Manufacturer: ArmaLaser Color: Black Beam Color: Green Laser Output: 4 mW Wavelength: 520 nm Maximum Range: 50 ft Attachment Type: Weaver Picatinny Battery Type: 357 CR1/3N Lithium Battery Life: Up to 2.3 hours Battery Quantity: 2 Gun Make: Heckler & Koch Fabric/Material: Zytel FRN Polymer Condition: New Mount Type: Weaver Features of ArmaLaser GTO/FLX Finger Touch Green Laser Sight for H&K Handguns Grip-Touch Activation by using FLX Side-Touch Activation without FLX Ultra-bright Class 3R 520nm Package Contents: ArmaLaser GTO/FLX Finger Touch Green Laser Sight for H&K Handguns What firearm models does the manufacturer say ArmaLaser GTO/FLX Finger Touch Green Laser Sight for H&K Handguns is compatible with? The manufacturer suggests that ArmaLaser GTO/FLX Finger Touch Green Laser Sight for H&K Handguns is compatible with Heckler & Koch HK45 Compact Heckler & Koch HK45 Heckler & Koch P2000SK Heckler & Koch P2000 Heckler & Koch P30 Heckler & Koch P30L Heckler & Koch VP9 Heckler & Koch P30SKArmaLaser GTOGFLX13: GTO/FLX Finger Touch Green Laser Sight for HK45C Black