The Crimson Trace RAD (Rapid Aiming Dot) is a compact, budget-friendly reflex sight with a 3 MOA red dot - easy to mount, easy to zero, easy to use. Open emitter, multiple brightness settings, designed for pistol slide mounting via adapter plate or rail-mounted use. Specs: Reticle: 3 MOA red dot Housing: aluminum, matte black Illumination: multi-step brightness Battery: CR2032 Footprint: Picatinny mount included Honest positioning: The RAD is entry-tier - a solid first red dot for shooters new to the optic-ready pistol concept. For range use, training, and casual carry it does the job. Heavy-duty / professional use benefits from stepping up to Trijicon or Leupold.