Where can I find the serial number and product number on my HP ProBook 440 G3?

The service label providing the serial number, product number, warranty period, and model number is located on the bottom of the computer, inside the battery bay, under the service door, or on the back of the display. When contacting support, you will likely be asked for the serial number and possibly the product number or model number, so it is important to locate these before calling. (Page 17)