Flip up lens cover is easy to install. You only have to remove the EOTech hood and install the new hood and lens cover module. Type III hard anodized matte black to mil-spec and matches the original EOTech finish. All of the windage and elevation calibration markings on the new hood are fully engraved and present an off-white appearance to make it easier for the end user to reference.
Lens covers are spring operated so that once pressure is applied to release them from the closed position they spring open. Rear cover lies across the top so as not to interfere with the field of view. Front cover opens and serves as a sun shield.
Rifle scope lens covers are not 100% waterproof but they do prevent most dust, debris, rain and snow from accumulating on the lenses.