*Promotes rapid target acquisition while providing a precise point of aim; getting shots in range and on target quickly.*The red dot has multiple brightness level with an adjustment button. Every time you turn on the point it maintains the same brightness level as the last time it was turned off*1.75"e;L x 1.25"e;W x 1.15"e;H. Shockproof, fogproof, and waterproof for 30 minutes under 4-foot water. Features 1 windage and elevation adjustment with audible clickThis ADE RD3-012, alone with RD3-006,RD3-009,RD3-013 do NOT fit Springfield HELLCAT OSP, because springfield Hellcat OSP red dot footprint is based on Shield RMS. ADE sights has the footprint of Doctor/Vortex Venom type footprint. This RD3-012, and RD3-006, RD3-009 and RD3-013 fits directly to "e;Optics Ready"e; pistols such as Glock MOS, Springfield OSP(non-hellcat), Canik TP9 SFX(non elite sc), Walter PPQ Q5 Match, FNX 45 Tactical, IWI Masada handguns that come with mounting plates that marked for DOCTOR/VORTEX VENOM type red dot. All mentioned above pistols must to be OPTICS READY model that comes with MOUNTING PLATE marked for DOCTOR/VORTEX.