Model and serial numbers The model number and printer serial number are listed on an identification label located under the top cover on the right side of the printer. The model number is alphanumeric, such as Q2431A for the HP LaserJet 4300 product. The serial number contains information about the country/region of origin, as well as the revision level, the production code, and the production number of the printer. An example of a serial number is USBB123456. The label also contains power-rating and regulatory information as shown in the following figure. Figure 1-1 Sample model and serial number label, HP LaserJet 4300 printer 8 1 Product information