Standarized by the DEA, ATF, and FBI HRT, the Model 552 from EOTech offers Night Vision-compatability. The AA battery model is the sight of choice by military units like Stryker Brigade, 10th Mountain and 3rd Infantry. It is battle-proven to withstand the abuse that any harsh environment, high-powered weapon platform, or military mission can dish out. Mounts to a Weaver or MIL-STD 1913 rail. Includes 30 brightness settings with 10 for Night Vision use. Accepts 2 AA batteries and has a runtime of 1,000 hours (lithium) or 600 hours with AA alkaline batteries at brightness setting 12. View 552 Operator's Manual PDF. Mfg: Eotech