Rifle scope 4-16x magnification 40mm objective lens (adjustable objective) 1" tube TAG-Style reticle (red-green illuminated) 10 yds to infinity AO parallax setting 25.0-6.3' field of view @ 100 yds 4.1-3.7" eye relief 10.0mm to 2.4mm exit pupil Scope length is 13.86" Includes CR2032 battery