This document provides information on the ATN PS28 Day/Night Clip-On System, including: 1) Contact information for ATN Corporation and details about export restrictions. 2) An overview of the PS28 as an upgraded clip-on night vision device that mounts in front of a daytime scope without needing re-zeroing. 3) Specifications for the PS28 such as a 1x magnification, 40mm exit pupil, 50 hours of battery life, and weather resistance.