Firefield FF16001 NVRS 3x42 Night Vision Riflescope High 3x magnification Lens focus(mm):70, Field of view(): 14, Eye relief(mm): 45, Diopter adjustment(dptr): 4 Ergonomic design Diameter, exit pupil - 6mm Built-in IR Titanium body Battery Life:(with IR),20 hours,Battery Life:(w/out IR), 50 hours High quality image and resolution Lightweight and durable titanium body Quick detach weaver mount Built-in, high power IR illuminator Incremental reticle brightness adjustment