The Vortex SPARC SOLAR delivers one of the longest lasting red dots available, offering users up to 150,000 hours of battery life. It achieves this with Auto D-TEC technology and an integrated solar panel/backup CR2032 battery power source. The Auto D-TEC automatically switches between solar-power and the backup battery based on the ambient light conditions, and features 12 illumination settings, two of which are night vision compatible. Because it has such a long battery life, the SPARC SOLAR has a 14-hour automatic shutoff, allowing users to keep the sight active for as long as they need without having to worry about power levels, and an motion activation feature means the red dot will always remain at the ready.