Built to work in any pursuit from competition to turkey hunting, the RXM-300 offers maximum field of view with our largest red dot window ever. A bright crisp 4 MOA dot with 12 brightness settings with an auto-ambient setting to changes brightness automatically based on environment. Protect and keep your glass clear with Bushnell's exclusive EXO Barrier™ lens coating that repels water, oil, dust and debris. The RXM-300 is ready to fit any firearm for virtually any application with its RMR footprint and included low and high weaver mounts. With battery life up to 35,000 hours and options like shake-awake and auto shut off timer to extend that time.