Designed specifically for pistol use, the HE507C-GR X2 Reflex Sight features the Super Green LED that provides a versatile range of intensities for the brightest environments down to no-light situations. Not only is the Super Green LED an option for those with difficulty seeing red, it also gives greater power efficiency when using the optic in high brightness settings But the innovation doesn't stop there. The HE507C-GR X2 also features HolosunA(R)'s Solar Failsafe technology that allows the Sight to remain powered when your battery fails, as well as Shake Awake technology that activates the LED upon motion. Once "awake," the 507C-GR X2 provides your choice of 2 MOA Red Dot, 32 MOA Circle, or both at the same time. Designed for use on pistols Advanced LED technology gives you up to 50,000 hours of use on single battery Super Green LED illumination Multiple Reticle System (MRS): choose either a 2 MOA dot, 32 MOA circle, or both 10 daylight/2 night vision brightness settings Solar Failsafe uses ambient light to power the Sight Shake Awake technology activates the Sight upon motion and shuts the LED off during periods of motionlessness CNC-milled 7075 aluminum housing Multilayer reflective glass helps facilitate maximum light transmission and clarity Order today!