The 2000 Series access control keypads from International Electronics, Inc. combine all of IEI's functionality groups into one powerful platform. These keypads can operate as a front-end to IEI access systems and most Wiegand controllers, or as a stand alone access control device. The keypads can manage up to 500 users. The 2000 Series e Style is a flush mount with backlit keys. The 2000 Style eM Style is a flush mount with durable metal keys.