For card or token access, one of three types of reader, AR-737HB-RAY/2, AR-737U or AR-721U would be mounted in the lift for passenger use The reader would be connected to a controller AR-727H (with display) or a controller, type AR-721H (no display) concealed nearby for access by a lift engineer only. Small quantities of tokens can be added or deleted directly from the controller keypad. The K50 can also be used as the concealed controller with these readers.