Trijicon RMR HD 1x Red Dot - Circle Dot - The Trijicon RMR HD is an innovative red dot pistol optic specifically designed for the evolving needs of Law Enforcement and the Military. Built on the foundation of the Trijicon RMR Adjustable LED model, the RMR HD features the same patented housing shape made from forged aluminum, robust electronic system, and quality lenses. Adding a long-lasting, top-loading battery, larger window, an innovative forward looking light sensor, multiple reticle options, market leading illumination adjustability, and it's clear the RMR HD is designed and built for duty use. The innovative forward looking light sensor gauges the brightness at target in auto mode and adjusts reticle brightness to be effective in any lighting scenario. A new reticle allows you to switch between a complex reticle or single crisp dot, both of which include a new super bright setting and an additional night vision setting. The RMR HD also allows the operator to adjust the Auto Illumination as well as the dot/circle contrast. Additional features include larger, more tactile buttons, new adjusters with greater audible and tactile feedback, and an expanded field of view. Offering the same footprint as the RMR and designed to fit most existing optics-ready duty holsters. The Trijicon RMR HD is ready for those needing a feature-rich optic with high performance and ultra-reliability. The new forward-mounted light sensor enables the RMR HD Automatic Brightness mode to read the lighting conditions at the target, rather than just at the user. No longer worry about "reticle washout" when engaging targets from a dimly lit space out to a brightly lit area - or "reticle bloom" when the shooting position is reversed. The LED intensity in the RMR HD automatically responds to the lighting conditions forward of the objective lens, providing an optimal aiming point. New light sensor design adjusts reticle illumination to target lighting conditions in auto mode, delivering a situationally ideal reticle brightness level.; Enhanced technology improves dynamic performance in changing lighting conditions, e.g., activation/deactivation of weapon-mounted lights.;