The HS506 is designed for day and night use, it is unaffected by extreme weather conditions. You have an unlimited field of view using the option of a 2 MOA dot with 65 MOA ring in a 30mm tube red dot. Featuring a shake awake sensor with last setting recall, parallax-free with unlimited eye relief. The LED allows up to 50,000 hours of operation on one CR2032 battery.The 506A comes equipped with flip-up protective caps and a Cantilever Weaver Mount.