Truglo XR29 1x Red Dot - 3 MOA Dot - Ideal for mounting on RMR optic-ready pistols Digital push-button brightness controls - 10 brightness settings. Remembers last used brightness setting when powering on Motion-sensing "wake" feature. 1-MOA windage and elevation adjust CNC-machined from aircraft-grade aluminum. 3-MOA RED*DOT reticle 29 x 18mm multi-coated objective lens Ideal for mounting on RMR optic-ready pistols Unlimited eye relief Auto-off feature preserves battery life (4-minute idle from last button push) Waterproof (IPX7) design Picatinny rail mount included Battery included (CR1632 3V) 20,000+ hour battery life Lifetime limited warranty