The brightness knob to the left side of the tube illuminates the center reticle through 12 brightness settings. The second focal plane design gives you quick target acquisition at 1-5x power. The ACSS reticle provides quick ranging, wind holds and moving target leads in an easy to use sighting system at 6x power. This tough scope is waterproof, fog resistant, and covered by a 3 year warranty. Flip up caps are included.