The CTS-1550 Electronic Sight is an ultra-compact Open Reflex Sight for pistols. Featuring a 3.0 MOA round aiming dot, the CTS-1550 will elevate your pistol's performance instantly. Easily user-installed by utilizing an industry-standard J-Point mounting interface, the CTS-1550 boasts a high efficiency LED for years of use. The ambient light sensor automatically adjusts to the lighting conditions and turns the device to the lowest setting when the included cover is used, extending battery life. The battery on the CTS-1550 is located underneath the device, allowing for co-witness despite its compact size. Specs Red Dot PlatformCompact & Sub-Compact Pistols FootprintJ-Point/RMSc Compatible Reticle3 MOA red Dot User AdjustableWindage and Elevation Battery Life20,000 hours (2+ years) Battery AccessBottom Mount ConstructionLight-weight polymer Co-WitnessNotch Cut Ambient Light SensorCT Radiant Features Designed for compact and sub compact firearms Battery life: 20,000 hours (2 years+) Light weight polymer construction Notch cut for co-witness Ambient light sensor Bright Red 3.0 MOA DOT