Features: Enclosed Emitter Optic with Direct MOS Slides Mount:The Osight SE MOS is the industry's-first enclosed emitter optic engineered with a direct MOS footprint, eliminating the need for adapter plates on compatible full-size GLOCK MOS slides. 2 MOA Dot & 32 MOA Circle: Switch between dot-and-circle, 2 MOA dot-only, or 32 MOA circle-only reticles for any shooting scenario. Enjoy sharp clarity and strong contrast for precise, confident aiming. Side-Loading CR1632 Battery: Effortless battery replacement without removing the optic ensures hassle-free re-zeroing. A high-end CR1632 battery offers easy accessibility while maintaining steady performance. Aspherical Lens: The aspherical lens ensures zero distortion, parallax-free performance, and exceptional clarity for rapid, precise target acquisition. Motion Sensor Function: The Osight SE MOS powers on at the slightest movement, and powers down after 3 minutes of inactivity to conserve battery.