Primary Arms Micro Red Dot Sight w/Removable Base - 2 MOA Dot MD-RBGII 2 MOA RED DOT: Features a 2 MOA red dot that appears to cover roughly 2 inches of target at 100 yards. BATTERY LIFE: Features 1,000 hours of battery life from the included CR2032 battery at a medium setting. ILLUMINATION: The brightness knob on the right side adjusts 11 brightness settings from night vision to daylight bright. 1913 PICATINNY BASE: Includes a removable base and is compatible with any industry standard micro mount system. 1-YEAR WARRANTY: If a defect due to materials, workmanship, or normal wear and tear has caused your product to malfunction, Primary Arms will either repair or replace.