The Sightmark Element Mini Solar red dot provides dependability on the highest level, allowing for continuous use from reliable battery or solar power. With up to 200,000 hours of battery life from a single CR2032 and the ability to run off top-mounted solar cells, the dual-power Element Mini Solars 3-MOA red dot reticle stays on in virtually any environment. When tactical situations get intense, dont fumble with buttons to adjust brightness.