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;