The HE509T-RD is a hard-use, nitrogen-purged enclosed LED sight designed for handgun applications. The HE509T-RD features a grade 5 titanium housing, Holosuns Super LED with up to 50k hour battery life, Multi-Reticle System, Solar Failsafe, and Shake Awake technology.The RD version adds improved glass clarity, Lock Mode, and a full Multi-Reticle System providing 2 MOA dot only, 32 MOA Circle only, or a Circle-Dot combination. HE509T-RD includes an adapter plate for compatibility with rmr-style footprints. HE509T-RD feature 12 intensity settings, two of which are compatible with night vision devices.