ATN's Obsidian LT core drives this hands free, compact, ergonomic and versatile thermal monocular for the best observation experience. The monocular fits in one hand and is can be helmet or head mounted for long term comfortable observation. Includes soft carry bag, battery, eye cup, manual and lens cloth. Series 640 Weight 10.05 oz Controls Manual Objective 19mm Focus Range 1580 yds Battery Life 2+ hrs Battery Size CR123A Field Of View 23.20 - 17.40 ft @ 100 yds Magnification 1-4x