The HE403C is a solar micro reflex sight designed for day and night use, unaffected by extreme weather conditions. There are 12 settings for the brightness of the 2 MOA dot reticle, 10 DL and 2 NV compatible brightness settings to match ambient lighting conditions. It features a green LED emitter and is parallax free with unlimited eye relief. The side mounted buttons allow for easy operation without obstructing the user's vision. It is powered by solar cell under normal usage and a back-up battery (CR2032) to supplement power requirements in low light conditions and has a shake awake sensor with last setting recall. A low mount and 1/3 Co-witness mount included.