Representing the latest advancement in Night Vision Optics, the ATN PS40-2I gives your daytime scope Night Vision capability in a matter of seconds. The ATN PS40-2I mounts in front of a daytime scope to enable nighttime operation. No shift of impact, no need to rezero nor change of eye relief occurs. The ATN PS40-2I uses the latest in image intensifier tube technology for outstanding resolution and performance. Precision optical alignment is essential for a front sight system to work properly. This is why each ATN PS40-2I is individually tested and aligned on an optical scale by our engineers to provide perfect alignment. The ATN PS40-2I is one of the most compact and lightweight NV systems in its class, at only 840 grams. ATN PS40-2I Features: ATN PS40-2I Spec Sheet ATN PS40-2I User Guide Easily changes daytime scope to Night Vision Mounts in front of daytime scope, no re-zeroing required Multi-coated all-glass optics Fast catadioptic front lens system Large 40 mm eyepiece/output window Lightweight and rugged Comes with Quick Release Mount Optional 7/8" weaver mount Optional Scope Mounting System attaches the PS40 unit to the objective of the day scope (47-50; 56-58.7 mm diameter) Automatic brightness control Limited Two-Year Warranty ATN PS40-2I Specs: Total Darkness IR System Yes "SMART" Technology No IIT Generation 2+ Photocathode type Multi-Alkali Resolution 40-45 lp/mm Figure of merit ATN PS40-2I - Day Night Weapon Sight NVDNPS402I