A new medium of tender employs both a primary barcode and a merchant specific extension barcode that are both associated with specific consumers. Logarithmic R-Q characteristics obtaining the adaptive R-Q characteristics suitable to characteristics of an inputted image are proposed, and the parameter compensating the difference between the coding efficiency of MPEG-1 and the coding efficiency of MPEG-4 is not fixed as a specific value but changed adaptively according to the characteristics of an image. The tracking assembly comprises a vertically adjustable tracking means disposed for engagement with the top surface of the curb, to provide a reference point. The device may be configured to accommodate different size beverage containers. If the names are found, they are delivered to the calling party.