A visible light characteristic changing layer is formed in a location which can be viewed from a part of a label surface of an optical medium. In response to triggering of a measure circuit, sample circuits sample outputs of a measure delay array. An RF transmission line formed in the metallization layers common to the first main printed wiring board and the second printed wiring board connect transceiver circuitry carried on the first main printed wiring board to respective radiating elements carried on the second printed wiring board. Data representative of a selection of an auxiliary content data item is received in association with the query, and a database record for the selected auxiliary content data item is caused to be amended to reflect the selection in association with at least part of the descriptive data included in the query. A third portion defines an opening to accommodate the module, wherein the roof of the module couples to a periphery of the opening in the retracted position.