Sentinel Features The next generation Swampfox Optics Sentinel ultra-compact micro red dot sight optimized for everyday carry-on slimline pistol slides. No plastic body or polymer lens for us only hard coated 7075 aluminum and multi-coated glass here. Sentinel-A truly never sleeps. A photosensitive sensor on the left side of the scope body provides a bright dot relative to ambient light in all conditions day or night. There are no manual controls at all no Shake 'N Wake - no way for Sentinel-A to be accidentally shut off ever. Install the CR2032 battery underneath Sentinel-A and you're good to go for two years straight. Sentinel will fit Glock 43X and Glock 48 MOS Sig P365XL Springfield Hellcat OSP Canik Elite SC S&W Shield 2.0 Optics Ready Walther PPS M2 Optics Ready - any slimline slide with an RMSc footprint incorporated either factory or gunsmith cut. Sentinel Specifications Battery Life: 2 yrs Brightness Settings: 10 settings Finish: Black Power Supply: CR 2032 Reticle: Red Dot Weight: .62 oz