The HE507K X2 is an open reflex optical sight designed for concealed carry pistols. The X2 has been redesigned with the addition of Lock Mode. This mode locks the buttons preventing inadvertent setting changes. The buttons have been redesigned to compliment Lock Mode by placing them lower and out of the way. The HE507K allows you to choose from multiple reticles and 12 different brightness settings, 2 of which are night vision compatible. This sight provides parallax-free viewing and unlimited eye relief. Multi-coated lenses ensure a bright and crisp sight picture. The CR1632 battery can provide up to 50k hours of battery life. Shake Awake technology powers the optic on when motion is detected.