Armasight Sirius is a rugged lightweight Multi-Purpose Night Vision Monocular that can be Hand Held, Camera Adaptable, Head/Helmet Mounted or Weapon Mounted. Armasight Sirius is based on “single tube/single eyepiece” concept where independent use of each eye maximizes the ability of the user to operate under a wide range of low light conditions while reducing the risk of temporary night blindness typically associated with night vision goggles. A built-in Illuminator allows you to see clearly even in total darkness. Armasight Sirius is available in two configurations, with variable gain control or automatic gain control. The variable gain control allows the user to increase or decrease image brightness for best possible contrast in any situation. Armasight Sirius is equipped with state of the art Bright Light Cut-Off System which controls the existing illumination level through the photo receiver. When the illumination level surpasses 100-300 lx for the following 10 seconds, the Monocular will shut off automatically. Sirius can be used as a long range Night Vision Spotter in conjunction with state of the art 3x, 5x or 8x lenses. Armasight Sirius is everything an outdoorsman, fisherman, tactical shooter, or hunter could ask for. Limited two-year warranty