DI Optical RV1 Raven Series Red Dot Reflex Sight with Rotary Switch Brightness Control 1. 5 moa dot size Large 30mm objective lens 11 brightness setting (4 nighttime and 7 daytime) Cnc machined from solid billet 6061-t6 aircraft quality aluminum for maximum durability. Approximately 20,000 battery life with 1-aa battery (mid brightness level).