The 8355 has a motor vibration isolation system for quiet, smooth operation and comes fully equipped with security and mobile app technology. With all the same home automation capabilities, it also provides peace of mind with a lifetime motor and belt warranty and a one-year parts warranty. Accessories for the 8355 are an additional cost, but you get to choose just what you want, including 3 different three-button mini remote control designs and a door and gate monitor.