Sig Sauer ROMEO 4T-PRO, Red Dot, 1X, 20mm Objective, Ballistic Circle Dot Reticle, 0.5 MOA Adjustment, Matte Finish, Flat Dark Earth SOR44102 Tactical solar powered red dot sight with 100,000+ hour battery life. Designed for short and medium range engagements and recreational shooting across a wide range of calibers and light conditions.