The power source could not be easier to find or change.
The auto brightness controls which are brought over from the success of the HD7, the HDx is sure to be a favorite, as the optic can age the reticle brightness dynamically.Lucid Optics HDx - Mid Sized Red Dot Sight, Black Featuring the new M5 Reticle, the HDx is fast and nimble, up to 30% faster than a conventional dot.