Model 512 is EOTech's most popular holographic weapon sight. It superb quality is ideal when you need the best in speed and versitility. Model 512 is similar to Model 552 with the exception of the night vision compatibility, making this scope the more affordable option when night vision is not necessary. Proven to withstand abuse in harsh environments and the impact from high powered weapons. The EOTech 512 uses two 1.5 v AA batteries which can be lithium, alkaline or recharable. The battery life is rated for 1,000 continuous hours for lithium and 600 continuous hours with a standard AA alkaline battery. The 552 is water resistant up to 33 feet (10m) and can mount on a 1" Weaver or 1" Picatnny MIL-STD-1913 rail.