Holosun Hs Classic 1X 2 MOA Dot 65 MOA Ring/Red Dot Black The Hs503R Is a Small Compact Micro Red Dot Optic That features Holosun's Rheostat Dial To Adjust Brightness settings. Employing Holosun's Led Technology, The Hs503R Can Achieve Constant On Battery Life Of Up To 100,000 hours On Medium Setting. This Optic features Holosun's Proprietary Multi-Reticle System (Mrs) Giving The User 2 reticles To Choose From. Magnification: 1X Field Of View: Unlimited Eye Relief: Unlimited Dot Size: 2 MOA Length: 2.75" Weight: 3.74 Oz Finish: Black Battery: Cr2032 Lithium Reticle: 65 MOA Ring/Red Dot Adjustment Size: .5 MOA Proofs: Water Resistant, Shockproof Optic Coating: Multi-Coated