A lens shape piezoelectric device which is thinner than the manufacture limit thickness, which is conventionally difficult to manufacture, and a method for manufacturing the same. In one implementation, an authentication server may generate authentication tokens defining access credentials for managed entities across a plurality of authentication domains, wherein the authentication tokens may control access to resources in an information technology infrastructure. Therefore, the present invention can be used as a walker, a wheelchair, a transportation chair, a golf trolley, and a spectator chair. Faceplates have clamps on the rear face for clamping the faceplates to seldom-used non-shelve portions of the rack display and other store fixtures, such as bars, stanchions, corners, etc.