Demographic and transaction data are presented in a report usable for marketing-related purposes and other applications using a camera apparatus to capture customer image data at a point-of-sale location and sends the image data to a customer image database where the image data is stored. In particular, an apparatus and a method in accordance with an embodiment of the present invention measure background noise and adjust volume of received sound andor ring signal accordingly. A lock mechanism mounted on the central spindle section includes a spring-loaded detent configured to engage an end opening of each of the through holes in the spindle when the through hole is in alignment with the detent, such that the spindle cannot rotate relative to the lock mechanism when the detent is inserted into a through hole.