The stairlift remains operative, even if the main supply is interrupted.There is no main voltage to any of the operating parts of the stairlift. There are no troublesome trailing mains cables, as with all AC powered lifts. Allows rapid and simple installation, without mess or disruption. Delivers smooth and near silent operational characteristics. Soft Start and Soft Stop means that there is no jolting or lurching as the lift starts or finishes its journey. This adds to the feeling of safety and stability. If you are interested in additional options or if you have any questions please contact us toll free at 1-800-774-2134.