Vantage Reflex sights offer an incredible value in a versatile, dependable sighting solution. 8-stage digital brightness control, high quality aluminum construction, and multi-coated optics for maximum clarity. A.I.M. (Auto Illumination Mode) conserves battery power by putting the sight into standby mode when no movement is detected for 5 minutes. The sight automatically powers-on immediately when it senses movement. A slide-out battery tray allows easy battery replacement without removing the sight or needing to re-zero.