Model 552 is the model of choice for elite military forces and government agencies like the DEA ATF and FBI. It's night vision-compatible and has been battle-tested by Special Forces units around the world. This AA battery model is battle-proven to withstand the abuse of any harsh environment high-powered weapon platform or military mission. Are you a sportsman interested in hunting with night vision? Give the 552 another look. The 552 is EOTech's most affordable night vision-compatible sight and it partners with most night vision-devices. The 552 is designed to increase your speed to target even after the sun goes down. Product Details: Length/Width/Height: 5.4 x 2 x 2.25 - Weight: 10.9 oz - Waterproof: Submersible to 33 ft. depth - Mount: 1 Weaver or MIL-STD-1913 rail - Return to Zero: Repeatable to within 1 MOA after re-mounting - Brightness: 20 daylight settings 10 additional settings for Gen I through III+ night vision devices - Power Source: Two 1.5 V AA batteries Supports lithium alkaline or rechargeable - Battery Life: Lithium: 1000 continuous hours at nominal setting 12 AA alkaline: 600 continuous hours