Pulled this off website based on SN.
The Armasight NSMSIRIUS12GDH1 Multi-Purpose Night Vision Monocular is high-tech, tough, durable, and delivers good performance. Packed with features, the Sirius features a Gen 2+ image tube, and is equally at home with a hunter as it is with a professional security officer or a law-enforcement professional. Mission configurable, the monocular can be hand-held, or head / helmet mounted; it can also be mounted onto a rifle with a variety of different mounts, or in front of a camcorder or camera for night photography. Optional 3, 5, or 8x lenses can turn it into a long-range, night-viewing device in seconds.
Incredibly for such a low cost unit, the Sirius features manual brightness control, bright light shut-off circuitry, and a spot / flood built-in IR illuminator. The Armasight Sirius is a night vision work-horse that will satisfy the requirements of the most demanding professional or casual night-vision user with room to spare.
Gen 2+ image tube
Compact and rugged design
Head or helmet mountable for hands-free usage
Auto brightness control
Bright light cut-off
Ergonomic, simple, and easy-to-operate controls
Utilizes single CR123A lithium battery or AA alkaline (adapter included)
Adaptable for use with cameras
Built-in infrared illuminator and flood lens
Life tracker system available for measuring hours of operation (optional)
How come everybody I meet is a deer hunting expert?