Features: Specifications: Battery life: 50,000 hours. Solar Failsafe Technology: the ARO works even without a battery. Shake Awake Technology: when the ARO detects movement, it turns on at the last intensity used. Dot: 2 MOA red. Battery: CR2032. Waterproof rating: IPX8. Adjustment range: +/- 50 MOA. Brightness level: 8 daylight levels and 4 IR levels. Click value: 0.5 MOA. Window size: 1.02''. Chassis: 6061 aluminium. Mounting: 1X 1/3 co-witness and 1 low mount.