Used in light-duty commercial installation or in residential applications with heavy carriage house style garage doors. Maximum duty cycle rating of 13 operations per hour; 50 operations per day. Features: All steel frame, noise-reducing technoloty for quieter operation, commercial grade rail system, quick release door arm for manual operation, automatic reconnect trolley, standard rail and chain assemblies for 8, 10, 12 and 14 foot doors, motor thermal overload protection, torque sensing reversing, deluxe light wall station, 3-button MegaCode transmitter, built-in MegaCode format receiver, includes infrared photo eye safety beam and dual courtesy lgihts