A stair lift includes a movable user carrier, an authentication device comprising a signal receiver and at least two signal emitters, wherein each emitter is assigned to a different user of the stairlift, operation adjustment means, for generating a behavioral profile of the stair lift, and a control unit for controlling the stairlift. A method of operating a stair lift includes authenticating one of at least two signal emitters assigned to a first user, and adjusting the behavioral profile of the stair lift according to a stored operation profile associated with the authenticated signal emitter.