This document describes the features and characteristics of the Optiset E Standard, Advance, and Advance Plus models. These devices comply with the limits for a Class B digital device under FCC rules, providing reasonable protection against harmful interference in residential installations. If the equipment causes harmful interference to radio or television reception, users are encouraged to try reorienting or relocating the receiving antenna, increasing the separation between the equipment and receiver, connecting the equipment to a different circuit than the receiver, or consulting a dealer or experienced radio/TV technician for assistance. It is important to note that changes or modifications to the equipment not approved by the responsible party for compliance may void the user's authority to operate the equipment. The equipment's radio noise emissions do not exceed Class B limits as set out in the Canadian Department of Communications Radio Interference Regulation.