Lenovo ThinkPad Edge E420s (English) User Guide - Page 31
Certificate of Authenticity label
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If no integrated wireless PCI Express Mini Card has been preinstalled in your computer, you can install one. To do this, follow the procedure in "Installing and replacing the PCI Express Mini Card for wireless LAN/WiMAX connection" on page 86 or "Installing and replacing the PCI Express Mini Card for wireless WAN connection" on page 89. Certificate of Authenticity label The Certificate of Authenticity label for the preinstalled operating system is attached. Printed on this label are the product ID and the product key information for your computer. Record this information and keep it in a safe place. You might need these numbers to start your computer or reinstall the operating system. The Certificate of Authenticity label of your computer is shown as below: Chapter 1. Product Overview 13