This document provides information on the ATN PS28 Day/Night Clip-On System, including: 1) Contact information for ATN Corporation and details that the products are subject to export laws and regulations. 2) An overview of the PS28 as the next generation of their popular night vision clip-on that mounts in front of a daytime scope to enable nighttime operation without needing to re-zero or change eye relief. 3) A list of key features and specifications for the PS28 such as its magnification, lens system, battery life, dimensions, and warranty.